SHAFAQNA – Visiting and maintaining the bond with relations and close friends is a valuable Islamic tradition. Ayah 27 of Surah Al-Baqarah and Ayahs 21 and 25 of Surah Al-Raad mention this as a divine bond and ask people not to break this bond. Various narrations have mentioned that even by simple greeting kindness and calm will appear in societies .
 Osoul Kafi, Vol. 4, Page 447.