It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Last night I was shown as though I had been admitted into Paradise, and I came out through one of its eight gates, and I saw my Ummah standing. They were presented to me man by man, and a balance was set up. My whole Ummah was placed in one pan of the balance and I was placed in the other pan, and I outweighed them. Then my whole Ummah, all of them together, was placed in one pan of the balance, and Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) was placed in the other pan, and he outweighed them. Then my whole Ummah was placed in a pan of the balance and Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) was placed in the other pan, and he outweighed them. Then the balance was lifted away."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7833