2:54

Remember when Musa returned with the Divine Book he said to his people: “O my people! You have indeed grievously wronged yourselves by taking the calf for worship; so turn in repentance to your Creator and slay the culprits among you; that will be best for you in His sight.” He accepted your repentance; surely He is the Forgiving, the Merciful.
Meaning:-
Grievously: great sorrow
Calf: cow or bull
Slay: kill in a violent way
Culprit: a person who is responsible for a crime or other misdeed.