The second “O Antiphon” from Jeanne Kun:
O Adonai and Ruler of the House of Israel, you appeared to Moses in the fire of the burning bush and on Mount Sinai gave him your law. Come, and with outstretched arm redeem us.
Exodus 3:2: “An angel of the Lord appeared to him in fire flaming out of a bush. As he looked on, he was surprised to see that the bush, though on fire, was not consumed”.
Exodus 6:6: “Therefore say to the Israelites: I am Yahweh. I will free you from the enforced labor of the Egyptians and will deliver you from their slavery. I will rescue you by my outstretched arm and with mighty acts of judgment”.