It is narrated from Sayyiduna Ka'b bin Malik (may Allah be pleased with him) that when Allah accepted his repentance, he came to the Prophet (peace and blessings be upon him) and said: Allah has saved me only through the blessing of truthfulness, so now as part of my repentance, I will never lie again, and I dedicate all my wealth for Allah and His Messenger. The Prophet (peace and blessings be upon him) said: It would be better if you keep some of it for yourself. He said: Then I will keep my share from Khaybar for myself.