It is narrated from Sayyiduna Abu Tha'labah al-Khushani (may Allah be pleased with him); he said: Two of my children died, so I said: "O Messenger of Allah, two of my children have died." The Messenger of Allah (peace and blessings be upon him) said: "Whoever has two children die, Allah will admit him into Paradise by the grace of His mercy towards them." The narrator said: Then Sayyiduna Abu Hurayrah (may Allah be pleased with him) met me and asked: "Are you the one whom the Messenger of Allah (peace and blessings be upon him) told this about the two children?" I said: "Yes." He said: "Had he (peace and blessings be upon him) told it to me, it would have been dearer to me than everything upon which the gates of Palestine are closed."
Hadith Referenceالمعجم الكبير للطبراني / باب اللام ألف / 18821