Galatians 3

15 Brethren, I speak after the manner of men; Though it be but a man's covenant, yet if it be confirmed, no man disannulleth, or addeth thereto.

16 Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of 15Brethren, I speak after the manner of men; Though it be but a man's covenant, yet if it be confirmed, no man disannulleth, or addeth thereto.