Sunan Ibn Majah, Chapter: The Book of the Sunnah

"The Messenger of Allah (saw) said: 'While the people of Paradise are enjoying their blessings, a light will shine upon them, and they will raise their heads, and they will see their Lord looking down upon them from above. He will say: "Peace be upon you, O people of Paradise." This is what Allah says in the Verse: "Salam (peace be upon you) - a Word from the Lord (Allah), Most Merciful." He will look at them and they will look at Him, and they will not pay any attention to the delights (of Paradise) so long as they look at Him, until He will screen Himself from them. But His light and blessing will remain with them in their abodes.'" (Da'if)