20 And when they* saw it,* the disciples were astonished, saying, "How did the fig tree wither at once?"
Matthew 21:20 Cross References - LEB
Isaiah 40:6-8
6 A voice is saying, "Call!" And he said, "What shall I call?" All ⌊humankind⌋* are grass, and all his loyalty is like the flowers of the field.
7 Grass withers; the flower withers when the breath of Yahweh blows on it. Surely the people are grass.
8 Grass withers; the flower withers, but* the word of our God will stand forever.