Ibn Umar, may Allah be pleased with him, narrates that the Messenger of Allah, peace and blessings be upon him, said: "Indeed, after a man's father passes away, maintaining ties with his father's friends is the greatest act of goodness." Narrated by Muslim.
Hadith Referenceمشكوة المصابيح / كتاب الآداب / 4917
Hadith Gradingالألبانی:صَحِيح | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «رواه مسلم (2552/13)»