Full text: 
O adonai et dux domus Israel qui Moysi in igne flammae rubi apparuisti et ei in Sina legem dedisti veni ad redimendum nos in bracchio extento
Genre: 

A

Mass/Office

Antiphon

Feast: 
Antiphonae Majores
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Great 'O' Antiphons

CAO concordances: 
CGBEMVHRDFSL