Charles Ellicott Commentary Deuteronomy 5:22

"These words Jehovah spake unto all your assembly in the mount out of the midst of the fire, of the cloud, and of the thick darkness, with a great voice: and he added no more. And he wrote them upon two tables of stone, and gave them unto me." — Deuteronomy 5:22 (ASV)

He added no more—that is, He spoke no more in this manner; or, there were only ten commandments. So Deuteronomy 5:25: “If we add to hear”—that is, in this fashion.