Deuteronomy 6:13

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

Thou shalt fear the Lord thy God, and serve him, and shalt swear by his name.

You shall fear the Lord your God; and you shall serve him, and shall swear by his name.

Thou shalt fear Jehovah thy God; and him shalt thou serve, and shalt swear by his name.