Sayyiduna Abu Umamah (may Allah be pleased with him) narrates: the Prophet (peace and blessings be upon him) established brotherhood between Sayyiduna Abu al-Darda' (may Allah be pleased with him) and Sayyiduna Salman al-Farisi (may Allah be pleased with him).
Al-Tabarani recorded it; its chain contains a narrator, Jisr bin Farqad, and he is da'if (weak). Other hadiths of this kind will come later.