Husayn bin al-Sa'ib bin Abi Lubabah narrates from his grandfather that when Allah Almighty accepted the repentance of Abu Lubabah (may Allah be pleased with him) for having stayed behind from the Messenger of Allah (peace and blessings be upon him), and for matters before that in which the Messenger of Allah (peace and blessings be upon him) had been displeased with him, Husayn states that Abu Lubabah (may Allah be pleased with him) said, when Allah Almighty accepted his repentance: "O Messenger of Allah! I will leave the house of my people in which I committed this sin, and move away and live near you, and I will give up my wealth as charity for Allah and His Messenger (peace and blessings be upon him)." The Messenger of Allah (peace and blessings be upon him) said to him: "'Al-thuluth' (one third) is sufficient for you" (this is according to Husayn's statement).
Muhammad bin Abi Hafsah narrated through the chain of Husayn bin al-Sa'ib bin Abi Lubabah that when Allah Almighty accepted the repentance of Abu Lubabah (may Allah be pleased with him), Abu Lubabah (may Allah be pleased with him) said: I came to the Prophet (peace and blessings be upon him) and told him everything, and he (peace and blessings be upon him) said: "'Al-thuluth' (one third) is sufficient for you."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7776