For although the Creator had forbidden that the manna should be gathered for two days, He yet permitted it on the one occasion only of the day before the Sabbath, in order that the yesterday’s provision of food might free from fasting the feast of the following Sabbath-day. … [Christ] did not directly defend His disciples, but excuses them; He interposes human want, as if deprecating censure; He maintains the honour of the Sabbath as a day which is to be free from gloom rather than from work; he puts David and his companions on a level with His own disciples in their fault and their extenuation; He is pleased to endorse the Creator’s indulgence.
For when it says of the Sabbath-day, “In it thou shalt not do any work of thine,” by the word thine it restricts the prohibition to human work—which every one performs in his own employment or business—and not to divine work. Now the work of healing or preserving is not proper to man, but to God. So again, in the law it says, “Thou shalt not do any manner of work in it,” except what is to be done for any soul, that is to say, in the matter of delivering the soul; because what is God’s work may be done by human agency for the salvation of the soul. By God, however, would that be done which the man Christ was to do, for He was likewise God.
He was called “Lord of the Sabbath,” because He maintained the Sabbath as His own institution. Now, even if He had annulled the Sabbath, He would have had the right to do so, as being its Lord, (and) still more as He who instituted it. But He did not utterly destroy it, although its Lord, in order that it might henceforth be plain that the Sabbath was not broken by the Creator, even at the time when the ark was carried around Jericho. For that was really God’s work, which He commanded Himself, and which He had ordered for the sake of the lives of His servants when exposed to the perils of war.
Since, in like manner, the prophet Elisha on this day restored to life the dead son of the Shunammite woman, you see, how that it was proper employment for the Creator’s Sabbaths of old to do good, to save life, not to destroy it; how that Christ introduced nothing new, which was not after the example, the gentleness, the mercy, and the prediction also of the Creator.
— Against Marcion IV.XII