Surah An-Nazi'at, ayah 20

79:20

فَأَرَىٰهُ ٱلۡأٓيَةَ ٱلۡكُبۡرَىٰ ٢٠

Fa arāhul-āyatal-kubrā

And he showed him the greatest sign,1842

Footnotes

1842 i.e., the miracle of his staff becoming a great snake.