Heaven and earth will pass (pareleusetai | παρελεύσεται | fut mid ind 3 sg) away, but my words will (parelthōsin | παρέλθωσιν | aor act subj 3 pl) never pass (parelthōsin | παρέλθωσιν | aor act subj 3 pl) away.
Reference
Matthew 24:35
Sequence
5