It is narrated from Sayyiduna Sa'id bin Amir al-Jumahi (may Allah be pleased with him) that one day the Messenger of Allah (peace and blessings be upon him) said: "O Abu Bakr, come; O Umar, come. I have been commanded, through revelation sent down to me from heaven, to establish brotherhood between you two. You two are brothers in this world and brothers in Paradise, so let each of you greet his companion with salam and shake his hand." So Abu Bakr (may Allah be pleased with him) took hold of Umar's (may Allah be pleased with him) hand. At this the Messenger of Allah (peace and blessings be upon him) smiled and said: "He will be before him; he will die before him." And he said: "O Zubayr, O Talhah, come. I have been commanded to establish brotherhood between you two. You two are brothers in this world and brothers in Paradise, so let each of you greet his companion with salam." So they did so. Then he said: "O Ali, come; O Ammar, come. I have been commanded to establish brotherhood between you two. You two are brothers in this world and brothers in Paradise, so let each of you greet his companion with salam." So they did so. Then he (peace and blessings be upon him) said the same to Ubayy bin Ka'b and Ibn Mas'ud (may Allah be pleased with them both), and they did so. Then he said the same to Abu al-Darda' and Salman (may Allah be pleased with them both), and they did so. Then he said the same to Sa'd bin Abi Waqqas and Suhayb (may Allah be pleased with them both), and they did so. Then he said the same to Abu Dharr and Bilal (may Allah be pleased with him), the freed slave of al-Mughirah bin Shu'bah, and they did so. Then he said: "O Usamah, O Abu Hind, come" (Abu Hind was the one who used to cup the Prophet (peace and blessings be upon him) and would drink his (peace and blessings be upon him) blood) "come," and he said the same to the two of them. Then he said the same to Abu Ayyub and Abdullah bin Salam (may Allah be pleased with them both), and they did so. Then the narrator related the complete hadith.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5492