Deuteronomy 5:12

Further, also, it is written concerning the Sabbath in the Decalogue which [the Lord] spoke, face to face, to Moses on Mount Sinai, “And sanctify ye the Sabbath of the Lord with clean hands and a pure heart.” And He says in another place, “If my sons keep the Sabbath, then will I cause my mercy to rest upon them.” The Sabbath is mentioned at the beginning of the creation [thus]: “And God made in six days the works of His hands, and made an end on the seventh day, and rested on it, and sanctified it.” Attend, my children, to the meaning of this expression, “He finished in six days.” This implieth that the Lord will finish all things in six thousand years, for a day is with Him a thousand years. And He Himself testifieth, saying, “Behold, to-day will be as a thousand years.” Therefore, my children, in six days, that is, in six thousand years, all things will be finished. …

But the Jews are sure to say, that ever since this precept was given through Moses, the observance has been binding. Manifest accordingly it is, that the precept was not eternal nor spiritual, but temporary, which would one day cease. In short, so true is it that it is not in the exemption from work of the sabbath, that is, of the seventh day, that the celebration of this solemnity is to consist, that Joshua the son of Nun, at the time that he was reducing the city Jericho by war, stated that he had received from God a precept to order the People that priests should carry the ark of the testament of God seven days, making the circuit of the city; and thus, when the seventh day’s circuit had been performed, the walls of the city would spontaneously fall. Which was so done; and when the space of the seventh day was finished, just as was predicted, down fell the walls of the city. …

22. It is also for this reason, that of all the ten commandments, that which related to the Sabbath was the only one in which the thing commanded was typical; the bodily rest enjoined being a type which we have received as a means of our instruction, but not as a duty binding also upon us. For while in the Sabbath a figure is presented of the spiritual rest, of which it is said in the Psalm, “Be still, and know that I am God,” and unto which men are invited by the Lord Himself in the words, “Come unto Me, all ye that labour and are heavy laden, and I will give you rest. Take My yoke upon you, and learn of Me; for I am meek and lowly in heart: so shall ye find rest unto your souls;” as to all the things enjoined in the other commandments, we are to yield to them an obedience in which there is nothing typical. …

3. But readers, gifted with greater curiosity, are naturally inclined to probe into the question further. How, they ask, can justice be satisfied seven times? And what are the vengeances? Are they for seven sins committed? Or is the sin committed once and are there seven punishments for the one sin? Scripture continually assigns seven as the number of the remission of sins. “How often,” it is asked, “shall my brother sin against me and I forgive him?” (It is Peter who is speaking to the Lord.) “Till seven times?” Then comes the Lord’s answer, “I say not unto thee, until seven times, but, until seventy times seven.” Our Lord did not vary the number, but multiplied the seven, and so fixed the limit of the forgiveness. After seven years the Hebrew used to be freed from slavery. …