It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) established brotherhood between Abu Ubaydah bin al-Jarrah and Abu Talhah (may Allah be pleased with them both).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12520