Mu'jam Kabir Tabarani 5087 — Sayyiduna Zayd bin Arqam wrote a letter

Sayyiduna Zayd bin Arqam (may Allah be pleased with him) wrote a letter of condolence to Sayyiduna Anas bin Malik (may Allah be pleased with him), some of whose people and family members had been martyred on the Day of al-Harrah: I give you glad tidings from Allah: I heard the Messenger of Allah (peace and blessings be upon him) say: "O Allah, forgive the Ansar, and the children of the Ansar, and the children of the children of the Ansar, and the women of the Ansar, and the women of the children of the Ansar, and the women of the children of the children of the Ansar."