King James Version
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.English Standard Version
To give a human example, brothers: even with a man-made covenant, no one annuls it or adds to it once it has been ratified.Catholic Public Domain Version
Brothers (I speak according to man), if a man’s testament has been confirmed, no one would reject it or add to it