It was narrated that Abu Dharr said:
"I heard the Messenger of Allah say: 'Everyone in the universe, in the heavens and on earth, prays for forgiveness for the scholar, even the fish in the sea." (DE)
English reference (DE): Vol. 1, Book 1, Hadith 239 (DE)
Arabic reference (DE): Book 1, Hadith 245 (DE)