第九章第14—17节耶稣说新布不能补在旧衣服上，新酒不能装在旧皮袋里。可见，这两个比喻说清楚了新旧约的关系。新约不是旧约的补丁，而是旧约的替代；新约的履行也不能放在一个旧人里，旧人需要首先否定全部的旧我去跟随耶稣。耶稣的门徒不需要去做法利赛人所做的旧约禁食。但是如果耶稣离开他们，他们就要禁“食”，因为“吃了”法利赛人和文士律法师的教导会失去“生命”。

太9:16 没有人把新布补在旧衣服上．因为所补上的、反带坏了那衣服、破的就更大了。
No one puts a piece of unshrunk cloth on an old garment; for the patch would tear away from the garment, and a worse hole is made.
太9:17 也没有人把新酒装在旧皮袋里．若是这样、皮袋就裂开、酒漏出来、连皮袋也坏了．惟独把新酒装在新皮袋里、两样就都保全了。
Neither do people put new wine into old wineskins, or else the skins would burst, and the wine be spilled, and the skins ruined. No, they put new wine into fresh wineskins, and both are preserved."
来8:13 既说新约，就以前约为旧了。但那渐旧渐衰的、就必快归无有了。
In that he says, "A new covenant," he has made the first old. But that which is becoming old and grows aged is near to vanishing away.
太16:24 于是耶稣对门徒说、若有人要跟从我、就当舍己背起他的十字架来跟从我。
Then Jesus said to his disciples, "If anyone desires to come after me, let him deny himself, and take up his cross, and follow me.