Hadith 1302
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever hears a person announcing a lost item in the mosque, let him say to him this (supplication) « لاَ أَدَّاھَا اللهُ عَلَيْكَ » May Allah not return it to you, for the mosques were not built for this purpose."
Hadith 1303
Abu Uthman narrates that Sayyiduna Ibn Mas'ud (may Allah be pleased with him) heard a man announcing a lost item in the mosque, so he became very angry and rebuked him harshly. Then a person said to him, "O Ibn Mas'ud, you were not one to use foul language?" He replied, "We were commanded to act in this manner (on such occasions)."