Pseudo-Chrysostom — as excerpted in the Catena Aurea on Mark 2:18-22

“(Vict. Ant. e Cat in Marc.) As if He said, because these are preachers of the New Testament, it is not possible that they should serve old laws; but ye who follow old customs, fitly observe the fasts of Moses. But for these, who are about to hand down to men new and wonderful observances, it is not necessary to observe the old traditions, but to be virtuous in mind; some time or other however they will observe fasting with other virtues. But this fasting is different from the fasting of the law, for that was one of restraint, this of goodwill; on account of the fervour of the Spirit, Whom they cannot yet receive. Wherefore it goes on, And no one putteth new wine into old bottles: else the new wine doth burst the bottles, and the wine is spilled, and the bottles will be marred: but new wine must be put in new bottles.”