Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates: When Hamzah (may Allah be pleased with him) was martyred on the day of Uhud, Sayyidah Safiyyah (may Allah be pleased with her) came looking for him, not knowing what had happened to him. She met Ali and Zubayr (may Allah be pleased with them both). Ali said to Zubayr: "You tell your mother (Safiyyah)." And Zubayr said to Ali: "You tell your aunt." Then Safiyyah asked: "What has become of Hamzah?" Both of them gave the impression that they did not know. Then the Prophet (peace and blessings be upon him) came and said: "I fear for her reason." Then he (peace and blessings be upon him) placed his hand on her chest and supplicated for her, and she said "Inna lillahi wa inna ilayhi raji'un (We belong to Allah and to Him we return)" and wept. Then he (peace and blessings be upon him) came to Hamzah, who had been mutilated, and standing over him said: "Were it not for the distress of the women, I would have left him as he is, until he was raised on the Day of Resurrection from the crops of birds and the bellies of wild beasts." Then he (peace and blessings be upon him) gave orders concerning the martyrs and began to offer the funeral prayer over them. Each time he would place nine martyrs together with Hamzah and say seven takbirs over them; then they would be lifted away and Hamzah would be left. Then nine more martyrs would be brought and seven takbirs said over them, until he finished with all of them.
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2922