(43) باب فَضْلِ السُّجُودِ وَالْحَثِّ عَلَيْهِ
Rabi'a b. Ka'b said:
I was with Allah's Messenger (ﷺ) one night. and I brought him water and what he required. He said to me: Ask (anything you like). I said: I ask your company in Paradise. He (the Holy Prophet) said: Or anything else besides it. I said: That is all (what I require). He said: Then help me to achieve this for you by devoting yourself often to prostration.
Reference: Sahih Muslim 489
In-book reference: Book 4, Hadith 256
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 990