en_tn_condensed/mrk/13/31.md

Heaven and earth

The two extremes are given to refer to all of the sky, including the sun, moon, stars, and planets, and all of the earth. Alternate translation: "The sky, the earth, and everything in them" (See: rc://en/ta/man/jit/figs-merism)

will pass away

"will cease to exist." Here this phrase refers to the world ending.

my words will never pass away

Jesus speaks of words not losing their power as if they were something that will never physically die. Alternate translation: "my words will never lose their power" (See: rc://en/ta/man/jit/figs-metaphor)