Sahih Muslim Book 31, Hadith Number 6101.
Chapter : The merits of the Ansar (Allah be pleased with them).
Anas reported that Allah’s Messenger (may peace be upon him) saw children and women of the Ansar coming back from a wedding feast. Allah’s Apostle (may peace be upon him) stood up motionless (as a mark of respect) and said: O Allah, (bear witness) (and addressing the Ansar), said: You are dearest to me amongst people, (and said: O Allah (bear witness) (and addressing the Ansar), said: You are dearest to me amongst people. And he meant Ansar.