Parallel
Deuteronomy 6:13
Brenton's English Septuagint · Berean Standard Bible
Thou shalt fear the Lord thy God, and him only shalt thou serve; and thou shalt cleave to him, and by his name thou shalt swear.
Fear the LORD your God, serve Him only, and take your oaths in His name (note: Or serve Him, and take your oaths only in His name; cited in Matthew 4:10 and Luke 4:8).