Tertullian

Both dispensations, therefore, emanate from that same God by whom, as we have found, they were both sketched out beforehand. When he speaks of "the liberty wherewith Christ hath made us free," does not the very phrase indicate that He is the Liberator who was once the Master? For Galba himself never liberated slaves which were not his own, even when about to restore free men to their liberty.

It was not meet that those who had received liberty should be "entangled again with the yoke of bondage" -that is, of the law; now that the Psalm had its prophecy accomplished: "Let us break their bands asunder, and cast away their cords from us, since the rulers have gathered themselves together against the Lord and against His Christ.