Narrated Abu Huraira:
Allah’s Apostle said, “It was said to Bani Israel, Enter the gate (of the town) with humility (prostrating
yourselves) and saying: “Repentance”, but they changed the word and entered the town crawling
on their buttocks and saying: “A wheat grain in the hair.”
Sahih Bukhari, Volume 4, Book55, Number 615