Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said to some women of the Ansar: "None of you will have three children die while she hopes for the reward, but she will enter Paradise." A woman said: O Messenger of Allah (peace and blessings be upon him)! And if there are two? He (peace and blessings be upon him) said: "Two as well."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 7138