Imam Baqir (A.S.)‏

صِلَةُ الْأَرْحَامِ تُزَكِّي الْأَعْمَالَ وَ تُنْمِي الْأَمْوَالَ وَ تَدْفَعُ الْبَلْوَى وَ تُيَسِّرُ الْحِسَابَ وَ تُنْسِئُ فِي الْأَجَلِ.

Maintaining relations with one’s kin purifies one’s actions, brings about an increase in wealth, repels misfortunes, eases the account [on the Day of Resurrection], and delays one’s appointed time of death.

al-Kafi, vol. 2, pg. 150