en_tn/mat/24/35.md

Heaven and the earth will pass away

The words "heaven" and "earth" are a synecdoche that includes everything that God has created, especially those things that seem permanent. Jesus is saying that his word, unlike these things, is permanent. Alternate translation: "Even heaven and the earth will pass away" (See: rc://en/ta/man/translate/figs-synecdoche)

my words will never pass away

Here "words" refers to what Jesus has said. Alternate translation: "what I say will always be true" (See: rc://en/ta/man/translate/figs-metonymy)