وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ مُحَمَّدِ بْنِ أَبِي بَكْرِ بْنِ عَمْرِو بْنِ حَزْمٍ، عَنْ أَبِيهِ، عَنْ أَبِي النَّضْرِ السَّلَمِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ لاَ يَمُوتُ لأَحَدٍ مِنَ الْمُسْلِمِينَ ثَلاَثَةٌ مِنَ الْوَلَدِ فَيَحْتَسِبُهُمْ إِلاَّ كَانُوا جُنَّةً مِنَ النَّارِ ‏"‏ ‏.‏ فَقَالَتِ امْرَأَةٌ عِنْدَ رَسُولِ اللَّهِ صلى الله عليه وسلم يَا رَسُولَ اللَّهِ أَوِ اثْنَانِ قَالَ ‏"‏ أَوِ اثْنَانِ ‏"‏ ‏.‏

Yahya related to me from Malik from Muhammad ibn Abi Bakr ibn Amribn Hazm from his father from Abu'n-Nadr as-Salami that the Messengerof Allah, may Allah bless him and grant him peace, said, "If three ofa muslim's children die, and he remains content with that, they willbe a protection for him from the Fire." A woman who was with theMessenger of Allah, may Allah bless him and grant him peace, said, "Ortwo, Messengerof Allah?", and he said, "Or two." Translation Not Available

Book Ref: Muwatta Imam Malik Book 16 Hadith 561
Web Ref:  Muwatta Imam Malik Book 16 Hadith 39