Sayyiduna Uthman bin Abi al-As (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Such a person has obtained a strong shield, three of whose children die after he has accepted Islam (or while he is a Muslim)."
Imam Abu Ya'la recorded it, and Imam al-Bazzar recorded it, though he transmitted the words "a thick shield"; and Imam al-Tabarani recorded it in al-Mu'jam al-Kabir. Its chain contains a narrator, Abdur-Rahman bin Ishaq Abu Shaybah, and he is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجنائز / 3974