Musannaf Ibn Abi Shayba 6:1079

Hafs ibn Ghiyath narrated to us, from Talq ibn Mu'awiyah, from Abu Zur'ah, from Abu Hurayrah, who said: A woman came to the Prophet, may Allah bless him and grant him peace, with a young boy and said, "O Messenger of Allah, supplicate to Allah for him, for I have buried three [children]." He said, "You have buried three?" She said, "Yes." He said, "You have indeed fortified yourself with a strong fortification against the Fire."