It is narrated from Sayyidah Aishah (may Allah be pleased with her) that Sayyiduna Abu Bakr (may Allah be pleased with him) said at the time of his death: Look at everything that has increased in my wealth during my caliphate, and return it to the caliph after me. Sayyidah Aishah (may Allah be pleased with her) said: When he passed away, we looked and found nothing added to his wealth except a she-camel with which he watered his orchard, and a slave who used to carry the children. Sayyidah Aishah (may Allah be pleased with her) said: I sent them to Sayyiduna Umar (may Allah be pleased with him). She said: I was told that he wept and said: May Allah have mercy on Abu Bakr; he has made things very hard for those after him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الفيء والغنيمة / 13008