Yahya related to me from Malik from Ibn Shihab from Said ibn al-Musayyab from Abu Hurayra that the Messenger of Allah, may Allah blesshim and grant him peace, said, "No muslim who has three children diewill be touched by the Fire except to fulfil Allah's oath."
USC-MSA web (English) reference: Book 16, Hadith 38
Arabic reference: Book 16, Hadith 560