Musnad Ahmad 30:2990

Yahya narrated to us, from Malik, who said: Al-Zuhri narrated to me, from Sa'id ibn al-Musayyib, from Abu Hurayrah, from the Prophet (peace and blessings of Allah be upon him), who said: "There is no Muslim whose three children die before reaching the age of puberty, but that the Fire will touch him only to fulfill the oath."