Rabi'a b. Ka‘b said

I was with God’s Messenger at night, and when I brought him his water for ablution and what he required, he told me to make a request. I said, “I ask to accompany you in paradise.” He asked if I had any other request to make, and when I replied that that was all, he said, “Then help me to accomplish this for you by devoting yourself often to prostration.” Muslim transmitted it.