The World Federation One Stop Fiqh

Ritual 56

If a person is given a gift to perform Hajjatul Islam and it later becomes known to him that it was unlawfully obtained by the donor, the pilgrimage is not valid and the real owner is entitled to reclaim it from the donor or the beneficiary. If he claims it from the beneficiary and the latter was unaware as to the true ownership, he should revert to the donor; otherwise, he has no right to revert to him.