Sayyiduna Alqamah bin Nadlah (may Allah be pleased with him) said: "The Messenger of Allah (peace and blessings be upon him), Sayyiduna Abu Bakr and Sayyiduna Umar (may Allah be pleased with them both) passed away while the houses of Makkah were called nothing but 'sawa'ib' (open dwellings, lived in without payment): whoever was in need lived in them, and whoever had no need let others live in them."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15099