The Golden Calf
And recall when Moses said to his people, 'O my people, you have wronged yourselves by worshiping the calf. So, turn in repentance to your Creator and kill yourselves. Then seek His forgiveness, for He is the relenting, the Most Merciful.'
2:54And when Moses said unto his people: O my people! Ye have wronged yourselves by your choosing of the calf (for worship) so turn in penitence to your Creator, and kill (the guilty) yourselves. That will be best for you with your Creator and He will relent toward you. Lo! He is the Relenting, the Merciful.