عَنْ كَعْبِ بْنِ مَالِكٍ رَضِيَ اللَّهُ عَنْهُ أَنَّهُ قَالَ قُلْتُ يَا رَسُولَ اللَّهِ إِنَّ مِنْ تَوْبَتِي أَنْ أَنْخَلِعَ مِنْ مَالِي صَدَقَةً إِلَى اللَّهِ تَعَالَى وَإِلَى رَسُولِهِ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَمْسِكْ بَعْضَ مَالِكَ فَهُوَ خَيْرٌ لَكَ قَالَ فَقُلْتُ إِنِّي أُمْسِكُ سَهْمِي الَّذِي بِخَيْبَرَ
It is narrated from Sayyiduna Ka‘b bin Malik (may Allah be pleased with him) that he said: O Messenger of Allah! Indeed, the requirement for the acceptance of my repentance is that I give up all my wealth and give it in charity for Allah and His Messenger. The Prophet (peace and blessings be upon him) said: Keep some of your wealth with you; it will be better for you. I said: Then I will keep that portion with me which I received in Khaybar.