The Ambrosian Rite doesn't use the Agnus Dei at Mass, except at Masses for the Dead, when it appears, in slightly different form, as the Transitorium (Communion chant):
The Feast of Pope St Pius X
4 hours ago
זמרו משכיל • zammerû maśkîl • ψάλατε συνετως • psallite intellegenter • canite erudite • sing ye wisely • chantez vous avec intelligence • lobsinget ihm klüglich • sing ye praises with understanding
Vere quia dignum tibi gratias agere, æterne Deus. Recensemus enim præclarissimæ Nativitatis diem, quo gloriosissima Dei Genetrix, intemerata Virgo Maria, stella corusca et admirabilis, mundo effulsit. Quæ nobis perennis vitæ januam quam Eva in paradiso clauserat, reseravit: nosque de tenebris ad lucis antiquæ gaudia revocavit. Per eumdem...
(For it is truly meet to give thee thanks, eternal God; since we are celebrating the day of a most illustrious birth, when the most glorious Mother of God, the spotless Virgin Mary, the brigh and wonderful star, shone upon the world. It is she who hath opened unto us again the gate of everlasting life, which Eve had closed in paradise: and hath brought us back from darkness to the joys of the ancient light. Through the same Jesus Christ...)
Gloria in excelsis Deo, et in terra pax hominibus bonae voluntatis. Laudamus te, hymnum dicimus tibi. Benedicimus te. Glorificamus te: adoramus te. Gratias tibi agimus propter magnam gloriam tuam, Domine Deus, rex caelestis, Deus Pater omnipotens, Jesu Christe, sancte Spiritus. Domine Deus, Filius Patris: Agnus Dei, qui tollis peccata mundi, suscipe deprecationem nostram. Qui sedes ad dexteram Patris, miserere nobis: miserere nobis, subveni nobis, dirige nos, conserva nos, munda nos, pacifica nos. Libera nos ab inimicis, a tentationibus, ab haereticis, ab arrianis, a schismaticis, a barbaris: quia tu solus sanctus, tu solus Dominus, tu solus Altissimus, Jesu Christe, in gloria Dei Patris cum sancto Spiritu in saecula saeculorum. Amen.(Glory in the highest to God, and on earth peace to men of good will. We praise Thee, a hymn we say to Thee. We bless Thee. We glorify Thee: we adore Thee. Thanks to Thee we give for Thy great glory, Lord God, heavenly King, God the Father almighty, Jesu Christ, [and] Holy Ghost. Lord God, Son of the Father: Lamb of God, Who takest away the sins of the world, receive our prayer. Who sittest at the right of the Father, have mercy on us: have mercy on us, come to help us, direct us, preserve us, cleanse us, pacify us. Deliver us from enemies, from temptations, from heretics, from Arians, from schismatics, from barbarians: for Thou only art holy, Thou only art the Lord, Thou only art the Most High, Jesu Christ, in the glory of God the Father with the Holy Spirit unto the ages of the ages. Amen.)
Gloria in excelsis Deo, * et in terra pax hominibus bonae voluntatis.
Laudamus te, hymnum dicimus tibi, * benedicimus te, adoramus te, glorificamus te.
Gratias tibi agimus propter magnam gloriam tuam, * Domine Deus, rex caelestis.
Deus Pater omnipotens, * Iesu Christe et sancte Spiritus.
Domine Deus, * Filius Patris
Agnus Dei, qui tollis peccata mundi, * suscipe deprecationem nostram;
Qui sedes ad dexteram Patris, * miserere nobis.
Miserere nobis, subveni nobis, dirige nos: * conserva nos, munda nos, pacifica nos.
Libera nos ab inimicis, * a tentationibus.
Quia tu solus sanctus, * tu solus Dominus, tu solus Altissimus,
Jesu Christe, * in gloria Dei Patris cum sancto Spiritu.
Per singulos dies benedicimus te, * et laudamus nomen tuum in æternum, et in sæculum sæculi. [Ps 144:2]
Dignare, Domine, die isto, * sine peccato nos custodire. [ex Te Deum]
Benedictus es, Domine, * doce me iustitias tuas. [Ps 118:12]
Vide humilitatem meam et laborem meum * et dimitte omnia peccata mea. [Ps 24:18]
Eructabunt labia mea hymnum, * hymnum Deo nostro. [Ps 118:171a; cf. 39:4]
Vivet anima mea et laudabit te, * et iudicia tua adiuvabunt me. [Ps 118:175]
Erravi sicut ovis, quae perierat: * require servum tuum, quia mandata tua non sum oblitus. [Ps 118:176]Cito anticipent nos misericordia tua, Domine,+ quia pauperes facti sumus nimis, * adiuva nos, Deus salutaris noster. [Ps 78:8b-9a]
Benedictus es, Domine, Deus patrum nostrorum, * et laudabilis et gloriosus in sæcula sæculorum. Amen. [Dan 3:52a](Glory in the highest to God, * and on earth peace to men of good will.
We praise Thee, a hymn we say to Thee, * we bless Thee, we adore Thee, we glorify Thee.
Thanks to Thee we give for Thy great glory, * Lord God, heavenly King.
God the Father almighty, * Jesu Christ, and Holy Ghost.
Lord God, * Son of the Father,
Lamb of God, Who takest away the sins of the world, * receive our prayer;
Who sittest at the right of the Father, * have mercy on us.
Have mercy on us, come to help us, direct us: * preserve us, cleanse us, pacify us.
Deliver us from enemies, * from temptations.
For Thou only art holy, * Thou only art the Lord, Thou only art the Most High,
Jesu Christ, * in the glory of God the Father with the Holy Spirit.
(Every day we will bless Thee: and we will praise Thy name for ever; yea, for ever and ever.
Vouchsafe, Lord, this day, * to keep us without sin.
Blessed art thou, O Lord: teach me Thy justifications.
See my abjection and my labour, * and forgive me all my sins.
My lips shall utter a hymn, * a hymn to our God.
My soul shall live and shall praise Thee, * and Thy judgments shall help me.
I have gone astray like a sheep that is lost: * seek Thy servant, because I have not forgotten Thy commandments.
Let Thy mercies speedily prevent us, Lord, + for we are become exceeding poor, * help us, O God, our saviour.
Blessed art Thou, O Lord the God of our fathers, * and worthy to be praised, and glorified unto the ages of the ages. Amen.)
Most dearly beloved:The elders that are among you, I beseech, who am myself also an elder, and a witness of the sufferings of Christ: as also a partaker of that glory which is to be revealed in time to come: feed the flock of God which is among you, taking care of it, not by constraint, but willingly, according to God: not for filthy lucre's sake, but voluntarily: neither as lording it over the clergy, but being made a pattern of the flock from the heart. And when the prince of pastors shall appear, you shall receive a never fading crown of glory.But the God of all grace, who hath called us into his eternal glory in Christ Jesus, after you have suffered a little, will himself perfect you, and confirm you, and establish you. To him be glory and empire for ever and ever. Amen.
Deus autem Rex noster ante sæcula: operatus est salutem in medio terræ.Tu confirmasti in virtute tua mare: contribulasti capita draconum in aquis.Tu confregisti capita draconis...But God is our King before the ages: He hath wrought salvation in the midst of the earth.Thou hast strengthened the sea in Thy power: Thou hast crushed the heads of the dragons in the waters.Thou hast broken the head of the dragon...
Deus, qui operatus es salutem in medio terræ (Ps 73:12b); a quo tenebræ non obscurabuntur, et nox sicut dies illuminabitur (Ps 138:12a), illumina, quæsumus, tenebras nostras: ut, tranquillam et quietam noctem deducentes, matutinis horis in tuis laudibus consurgamus. Per Christum Dominum nostrum. R/. Amen.
O God, who hast wrought salvation in the midst of the earth, from whom darkness is not hid, and night is as light as day, enlighten, we beseech thee, our darkness: that, having passed a tranquill and quiet night, we may arise in the morning hours to thy praises. Through Christ our Lord. R/. Amen.


Sicut enim majus est illuminare quam lucere solum, ita majus est contemplata aliis tradere quam solum contemplari.
Where orthodoxy is optional, orthodoxy will sooner or later be prohibited.