The O Antiphon for December 18:
et Dux domus Israel,
qui Moysi in igne flammæ rubi apparuisti,
et ei in Sina legem dedisti:
veni ad redimendum nos in brachio extento.
O Adonai and Ruler of the house of Israel,
who appeared to Moses in the burning bush
and gave him the Law on Sinai:
Come with an outstretched arm and redeem us.