Sayyiduna Abu Buraydah (may Allah be pleased with him) reports this saying of the Prophet (peace and blessings be upon him): "In Paradise there will be lofty chambers whose outside can be seen from the inside and whose inside can be seen from the outside. Allah Almighty has prepared them for those who love one another for the sake of Allah Almighty, those who visit one another for His sake, and those who spend on one another for His sake."
Imam al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains a narrator, Isma'il bin Sayf, and he is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الزهد / 18006