Adam Clarke

Joseph was thirty years old - As he was seventeen years old when he was sold into Egypt, Gen 37:2, and was now thirty, he must have been thirteen years in slavery. Stood before Pharaoh - This phrase always means admission to the immediate presence of the sovereign, and having the honor of his most unlimited confidence. Among the Asiatic princes, the privilege of coming even to their seat, of standing before them, etc., was granted only to the highest favorites.