He had his beard
    shaved by the barber, then he repented – so should he pay the barber?
Question

                A man had his beard shaved, and said (to
    the barber), “I will pay you later, I owe you.” Then Allaah guided him and he
    began to follow the Islamic rulings [i.e., he grew a beard]. Should he pay the barber or
    not?
Praise be to Allah.We put this question to Shaykh Muhammad ibn Saalih
    al-‘Uthaymeen, may Allaah preserve him, and he answered as follows:
He should tell him: “I am not going to give you the money, because
    it was (in payment for) a haraam deed,” and he should give it away in charity. And
    Allaah knows best.