Translation of the commemoration from this morning's Lauds:
Commemoratio S. Gabrielis Archangeli
Ant. The Angel Gabriel * came down unto Zacharias, and said unto him : Thy wife shall bear thee a son, and thou shalt call his name John, and many shall rejoice at his birth; for he shall go before the face of the Lord, to prepare His ways.
V. An Angel stood at the Altar of the Temple.
R. Having a golden censer in his hand.
Let us pray.
O God, Who didst choose the Archangel Gabriel from among all Thine other Angels, and send him to herald the mystery of Thine Incarnation, mercifully grant that we who keep his feast upon earth may feel his protection in heaven.
Who livest and reignest with God the Father in the unity of the Holy Spirit, one God, world without end.