Layth, from Mojahiid, from ibn Abbas, who said:
There will be a time that the inhabiants of Paradise will see the light of the sun and the moon, so they will say, "
Did our Lord not promise us that we will not see the light of the sun or the moon in Paradise?"
A caller will reply to them, "ALLAH (SWT) has fulfilled His promise and you will not see the light of the sun nor the light of the moon, but one of the Shia of ALI (ASWS) moved from one of his rooms to another room, and the light that you saw was from his face.
(Ref: Bihar Al – Anwar 8:149)