It is narrated from Sayyiduna Abu Malik (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "In Paradise there is a chamber whose outside can be seen from its inside and its inside from its outside. Allah has prepared it for the one who feeds others, speaks gently, keeps up the prayer regularly, and stands (in prayer) at night while people are asleep."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3453