Narrated Abu Sa`id Al-Khudri: Some women requested the Prophet to fix a day for them as the men were taking all his time. On that he promised them one day for religious lessons and commandments. Once during such a lesson the Prophet said, "A woman whose three children die will be shielded by them from the Hell fire." On that a woman asked, "If only two die?" He replied, "Even two (will shield her from the Hell-fire).
Hadith Referenceصحيح البخاري / كتاب العلم / 101
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
Narrated Abu Sa`id Al-Khudri: as above (the sub narrators are different). Abu Huraira qualified the three children referred to in the above mentioned Hadith as not having reached the age of committing sins (i.e. age of puberty) .
Hadith Referenceصحيح البخاري / كتاب العلم / 102
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة