Abdullah bin Qays (may Allah have mercy on him) said: I heard Sayyiduna al-Harith bin Uqaysh al-Ukli (may Allah be pleased with him) narrating to Abu Burdah (may Allah have mercy on him); he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Any Muslim husband and wife who lose four children, and bear it patiently hoping for reward, will both enter Paradise." It was said: O Messenger of Allah! What if they are three? He (peace and blessings be upon him) said: "Three as well." It was said: What if they are two? He (peace and blessings be upon him) said: "Two as well."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3346