The Prophet ﷺ said, "In Paradise there are chambers whose outside can be seen from within and whose inside can be seen from without."An Arabi stood up and asked, "For whom are they, Messenger of Allah?"He replied, "For those who speak kindly, feed others, fast regularly, and pray to Allah by night while people sleep."
حدثنا علي بن حجر حدثنا علي بن مسهر عن عبد الرحمن بن إسحق عن النعمان بن سعد
قال النبي ﷺ إن في الجنة غرفا ترى ظهورها من بطونها وبطونها من ظهورها فقام أعرابي فقال لمن هي يا رسول الله قال لمن أطاب الكلام وأطعم الطعام وأدام الصيام وصلى لله بالليل والناس نيام
[Hasan]. Ahmad narrated it: 1/155, 156, and Ibn Khuzayma, no. 2136, from the hadith of Abdul-Rahman bin Ishaq Kufi, and he is daif. The hadith has a corroborating witness in Ahmad: 5/343, which Ibn Hibban graded sahih, and its chain is hasan. The hadith has other corroborating witnesses in Hakim: 1/80, 321, and elsewhere.