Ma'rur bin Suwayd (may Allah have mercy on him) said that Sayyiduna Umar (may Allah be pleased with him) narrated a story, then recited this verse of the Qur'an: "Indeed, Allah has purchased from the believers their lives and their wealth in exchange for Paradise" [Surah al-Tawbah: 111], and said: He made both parts of the bargain His. By Allah! Had Allah not supplied you with treasures from Himself, I would have taken from a man whatever wealth exceeded the needs of himself and his family and distributed it among the poor of the Muhajirun.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللقطة / 12131