late 13c., "an order from an authority," originally "any one of the ten injunctions engraved upon stone tablets and given to Moses on Mt. Sinai according to Exodus," from Old French comandement "order, command," from Latin *commandamentum, from *commandare (see command (v.)). Pronounced as four syllables until 17c.
Of þe x commandements ... þe first comondement is þis, O God we ssul honuri [c. 1280]
Commandments, short for The Ten Commandments, is attested from early 13c. In Old English they were ða bebodu.