Remember that when We took a Covenant from you and We lifted the Mount of Tur over your heads saying: “Take what We have given you firmly and listen to Our Commandments,” you replied: “we have heard but we will not obey.” So much was the love of that calf in their hearts due to their unbelief. O Muhammad, tell them: “If you are real believers, then why does your faith prompt you to do such evil things?”
Meaning:-
Calf: a young bovine (bovine means: bull, ox or cow ) animal, especially a domestic cow or bull in its first year.