Musnad Ahmad 27:1114

Safwan ibn Isa narrated to us, Usamah ibn Zayd informed us, from Nafi, from Abdullah ibn Umar, that when the Messenger of Allah (peace and blessings of Allah be upon him) returned from Uhud, he heard the women of the Ansar weeping for their husbands. He said: "But Hamzah has no one to weep for him." This reached the women of the Ansar, so they came and wept for Hamzah. He said: The Messenger of Allah (peace and blessings of Allah be upon him) awoke during the night and heard them weeping. He said: "Woe to them! They have not ceased weeping since the night. Order them to return, and let them not weep for any deceased person after today."