Abu Huraira told that after God's messenger had stated that God most high has said, "I have prepared for my upright servants what eye has not seen, nor ear heard, nor has entered into the heart of man," 1 he added, "Recite, if you wish, `No soul knows what comfort has been concealed for them'." [2]
1. Cf. 1 Corinthians, 2:9.
2. Quran, 32:17.
(Bukhari and Muslim.)