When someone’s child dies

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الْحَمْدُ لِلَّهِ إِنَّا لِلَّهِ وَإِنَّا إِلَيْهِ رَاجِعُونَ

This can also be read when any calamity befalls. By saying so, Allah instructs His angels to build a house for His servant in Jannah and to name it “Bait-ul-Hamd” (House of Praise).

(Hisnul Hasin from Tirmidhi)