1 Kings 18:31

18:31 Then Elijah took twelve stones, corresponding to the number of tribes that descended from Jacob, to whom the Lord had said, “Israel will be your new name.”

Acts 21:26

21:26 Then Paul took the men the next day, and after he had purified himself along with them, he went to the temple and gave notice of the completion of the days of purification, when the sacrifice would be offered for each of them.