He who likes that his sustenance should be expanded and his age may be lengthened should join the tie of kinship.
Sahih Muslim Book 45, Hadith 24
← Previous Hadith I heard Allah's Messenger (ﷺ) as saying: He who is desirous that his means of sustenance should be expanded for him or his age may be lengthened, should join the tie of relationship.

Sahih Muslim Book 45, Hadith 23 Next Hadith → Allah's Messenger, I have relatives with whom I try, to have close relationship, but they sever (this relation). I treat them well, but they treat me ill. I am sweet to them but they are harsh towards me. Upon this he (the Holy Prophet) said: If it is so as you say, then you in fact throw hot ashes (upon their faces) and there would always remain with you on behalf of Allah (an Angel to support you) who would keep you dominant over them so long as you adhere to this (path of righteousness).

Sahih Muslim Book 45, Hadith 25