Sunan An-Nasa'i

Rabi'ah bin Ka'b Al-Aslami said:""I used to bring to the Messenger of Allah (ﷺ) water for wudu and serve him. He said: 'Ask of me.' I said: 'I want to be with you in Paradise.' He said: 'Is there anything else?' I said: 'That is all.' He said: 'Help me to fulfill your wish by prostrating a great deal