“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.”
King James Version (KJV)
3:15 I speak after the manner of men - I illustrate this by a familiar instance, taken from the practice of men. Though it be but a man's covenant, yet, if it be once legally confirmed, none - No, not the covenanter himself, unless something unforeseen occur, which cannot be the case with God. Disannulleth, or addeth thereto - Any new conditions.
Ga 3:15 I speak after the manner of men. I will make a comparison with human affairs. Though [it be] but a man's covenant, etc. A covenant, or agreement, among men, after it is ratified, cannot be annulled or altered without the consent of both parties.