The Messenger of Allah ﷺ said, "In Paradise there is a chamber whose outside can be seen from within and whose inside can be seen from without. Allah has prepared it for those who feed others, speak gently, fast regularly, and pray at night while people are asleep."
قال رسول الله ﷺ: إن في الجنة غرفة يرى ظاهرها من باطنها، وباطنها من ظاهرها، أعدها الله لمن أطعم الطعام، وألان الكلام، وتابع الصيام، وصلى والناس نيام.
Imam Ahmad narrated it (22905), and Tabarani in Kabir (3466), and Ibn Khuzayma graded it sahih (2137), and Ibn Hibban (509), all of them through Abdul-Razzaq, and it is in his Musannaf (20883), from Mamar, from Yahya bin Abu Kathir, from Ibn Manaq or Abu Manaq, from Abu Malik Ashari, and he related it.Its chain of transmission is hasan because of Ibn Manaq, who is Abdullah bin Manaq Ashari, as Ibn Hibban said following the hadith, and his kunya is Abu Manaq. He was deemed trustworthy by Ibn Hibban and by Ajli, and he belongs to the generation of Syrian successors, while Abu Malik Ashari was a companion of the Prophet, and his name was Harith bin Harith, and he too was Syrian, so it is possible for the two of them to have met. The discussion of this is treated at length in the Book of Prayer.