It is narrated from Sayyidah Umm Sulaym (may Allah be pleased with her); she said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Any Muslim husband and wife who have three children die before reaching puberty, Allah will admit them into Paradise by the bounty of His mercy." I asked: "And two?" He (peace and blessings be upon him) said: "And two as well."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21767