John Gill Commentary Luke 1:73

"The oath which he spake unto Abraham our father," — Luke 1:73 (ASV)

The oath which he swore to our father Abraham .
] When he swore by himself, because he could swear by no greater, that in blessing he would bless him; that his seed should possess the gates of his enemies, and in it all the nations of the earth should be blessed: all which have been fulfilled in Jesus the Messiah; see (Genesis 22:16–18) (Hebrews 6:13Hebrews 6:14).