Sahih Al Bukhari – Book of Good Manners And Form (Al-Adab)
Volumn 008, Book 073, Hadith Number 014.
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Narated By Abu Huraira : I heard Allah's Apostle saying, "Who ever is pleased that he be granted more wealth and that his lease of life be pro longed, then he should keep good relations with his Kith and kin."
Kith and Kin:
Literally, albeit archaically, friends (“kith”) and family (“kin”).