Musnad Ahmad 32:111

Ibn Abi ‘Adi narrated to us, from Humayd, from Musa ibn Anas, from Anas, that the Messenger of Allah (peace and blessings of Allah be upon him) was never asked for anything for the sake of Islam, except that he gave it. He said: A man came to him and asked him, so he ordered for him a large number of sheep, between two mountains, from the sheep of charity. He said: So he returned to his people and said: "O my people, embrace Islam, for Muhammad gives a gift of one who does not fear poverty."