Rabi'ah bin Ka'b Al-Aslami (May Allah be pleased with him (a servant of the Messenger of Allah and also one of the people of As-Suffah) said:
I used to spend my night in the company of Messenger of Allah ﷺ and used to put up water for his ablutions. One day he said to me, "Ask something of me." I said: "I request for your companionship in Jannah". He inquired, "Is there anything else?" I said, "That is all." He said, "Then help me in your request by multiplying your prostrations".

[Muslim].

الثاني عشر: عن أبي فراس ربيعة بن كعب الأسلمى خادم رسول الله ﷺ، ومن أهل الصفة رضي الله عنه قال: " كنت أبيت مع رسول الله ﷺ، فآتيه بوضوئه، وحاجته فقال: "سلني" فقلت: أسألك مرافقتك في الجنة. فقال: { أوغير ذلك؟" قلت: هو ذاك قال: " فأعني على نفسك بكثرة السجود" ((رواه مسلم)).