Musannaf Ibn Abi Shaybah 28353 — A man whose sandal strap breaks

Mujahid says that Sa'id bin al-Musayyib said: The strap of Sayyiduna Umar's (may Allah be pleased with him) sandal broke, and at this he recited: Inna lillahi wa inna ilayhi raji'un (We belong to Allah and to Him we return). The people said: "O Commander of the Believers! Even when a sandal strap breaks?" He said: "Yes. Everything that afflicts a believer and that he dislikes is a calamity."