Abdullah bin Ka;b bin Malik who used to lead his father from among his sons when he became blind, said: I heard Kaab bin Malik say: The transmitter Ibn al-sarh then narrated the story of his remaining behind from the prophet ﷺ forbade the Muslims to speak to any of us three. When ( in this state) abundant time passed on me, I ascended the wall of the garden of Abu Qatadah who was my cousin. I saluted him, but, I swear by Allah, he did not return salute to me. He then narrated the story of the revelation of the Quranic verses relating to his repentance.

Narrated Kab ibn Malik: I said: Messenger of Allah, to make my repentance complete I should divest myself of my property as sadaqah (alms) for Allah and His Messenger. The Messenger of Allah ﷺ said: Retain some of your property, for that will be better for you. So he said: I shall retain the portion I have at Khaybar.

Narrated Kab ibn Malik: Kab ibn Malik said to AbuLubabah; or someone else whom Allah wished; or to the Prophet ﷺ: To make my repentance complete I should depart from the house of my people in which I fell into sin, and that I should divest myself of all my property as sadaqah (alms). He said: A third (of your property) will be sufficient for you.

Narrated Kab ibn Malik: I said: Messenger of Allah, to make my atonement complete I should divest myself of my all property as sadaqah (alms) for Allah and His Messenger. He said: No. I said: The half of it. He said: No. I said: Then a third of it. He said: Yes. I said: I shall retain the portion I have at Khaybar.