I heard Messenger of Allah 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.

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ مَنْ سَرَّهُ أَنْ يُبْسَطَ عَلَيْهِ رِزْقُهُ أَوْ يُنْسَأَ فِي أَثَرِهِ فَلْيَصِلْ رَحِمَهُ