Galatians 3:18-20

Young's Literal Translation

¹⁸ for if by law [be] the inheritance, [it is] no more by promise, but to Abraham through promise did God grant [it].

¹⁹ Why, then, the law? on account of the transgressions it was added, till the seed might come to which the promise hath been made, having been set in order through messengers in the hand of a mediator --

²⁰ and the mediator is not of one, and God is one --