It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "In Paradise there are upper chambers whose outside can be seen from the inside and whose inside can be seen from the outside." Sayyiduna Abu Malik al-Ash'ari (may Allah be pleased with him) said: O Messenger of Allah! For whom are they? He (peace and blessings be upon him) said: "For those who speak gently, who feed others, and who stand (in tahajjud) at night while people are asleep." This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs did not record it.