Jami` at-Tirmidhi 2385

Anas narrated that a man came to the Messenger of Allah (s.a.w) and said:" O Messenger of Allah! When will the Hour be established?" So the Propher (s.a.w) stood to perform Salat and when he was finished his Salat he said: "Where is the one who asked when the hour will be established?" The man said: "It was I, O Mesenger of Allah!" He said: "What have you prepared for it?" He said: "O Messenger of allah! I have not prepared very much of salat nor fasting for it, but I love Allah and His Messenger." So the Messenger of Allah(s.a.w) said: "A man shall be with whom ever he loves, and you shall be with whomever you love." So after the advent of Islam, I did not see that anything brought the Muslims more happiness than that