20 When the disciples saw this, they marveled and asked, “How did the fig tree wither so quickly?”
Matthew 21:20 Cross References - BSB
Isaiah 40:6-8
6 A voice says, “Cry out!” And I asked, “What should I cry out?” “All flesh is like grass, and all its glory like the flowers of the field.
7 The grass withers and the flowers fall when the breath of the LORD blows on them; indeed, the people are grass.
8 The grass withers and the flowers fall, but the word of our God stands forever.”