Matthew 9:17

9:17 And no one pours new wine into old wineskins; ¹  otherwise the skins burst and the wine is spilled out and the skins are destroyed. Instead they put new wine into new wineskins ²  and both are preserved.”

Matthew 18:9

18:9 And if your eye causes you to sin, tear it out and throw it away. It is better for you to enter into life with one eye than to have ³  two eyes and be thrown into fiery hell. ⁴ 

[9:17]  ¹ sn Wineskins were bags made of skin or leather, used for storing wine in NT times. As the new wine fermented and expanded, it would stretch the new wineskins. Putting new (unfermented) wine in old wineskins, which had already been stretched, would result in the bursting of the wineskins.

[9:17]  ² sn The meaning of the saying new wine into new wineskins is that the presence and teaching of Jesus was something new and signaled the passing of the old. It could not be confined within the old religion of Judaism, but involved the inauguration and consummation of the kingdom of God.

[18:9]  ³ tn Grk “than having.”

[18:9]  ⁴ tn Grk “the Gehenna of fire.”