Let’s look at the words of Jesus in light of Isaiah.

Matthew 24:34–35
Verily I say unto you, This generation shall not pass, till all these things be fulfilled. Heaven and earth shall pass away, but my words shall not pass away.

Isaiah 66:22
For as the new heavens and the new earth, which I will make, shall remain before me, saith the LORD, so shall your seed and your name remain.

Notice the references to heaven and earth in both passages. One passage speaks of the old heaven and earth. The other passage speaks of the new heaven and earth. One passage speaks of what will pass away and won't pass way. The other passage speaks of what will remain. Both speak the same truth. It's as if I described a door before entering, and then described the same door from the other side. Same truth, parallel wording, parallel passages. Now notice what lays parallel to "this generation." It’s "your seed and your name."