ISB ~ Matthew 9 v17

new wine … old wineskins:Fermenting wine is accompanied by a build-up of pressure. If kept in skins already used and dried out, the wine would certainly burst them. Jesus thus illustrates the impossibility of inaugurating the New Covenant while maintaining the Old. The abundance of New Covenant grace cannot be contained within the structures of the Old Covenant (cf. Jn 1:16). A new kingdom is needed to contain it—one fashioned to endure for ever.