[VerySadAmerican]

The Bible says not to swear on anything. “Let your yes be yes and your no be no”. Yet we swear on it all the time.

Anyone know it Mohammed had anything to say about swearing on the Koran?

[Olog-hai]

Depends on the context of such oaths.

Thou shalt fear the LORD thy God, and serve him, and shalt swear by his name.
— Deuteronomy 6:13

Thou shalt fear the LORD thy God; him shalt thou serve, and to him shalt thou cleave, and swear by his name.
— Deuteronomy 10:20

Most leaders seem to be unaware that they are directly responsible to God; the Founders were not unaware. Probably why the alternate word “affirm” was included in the oaths of office.