Sahih Bukhari Volume 6, Book 60, Hadith Number 165.

Narrated By Abu Huraira : Allah’s Apostle said, “It was said to the children of Israel, ‘Enter the gate in prostration and say Hitatun. (7.161) We shall forgive you, your faults.’ But they changed (Allah’s Order) and entered, dragging themselves on their buttocks and said, ‘Habatun (a grain) in a Sha’ratin (hair).”