201 – Abū Hurayrah (may Allah be pleased with him) reported that the Messenger of Allah (peace and blessings be upon him) said: “If you hear a man in the mosque announcing the loss of an animal, say to him: ‘May Allah never return it to you, for mosques were not built for this.’” Related by Muslim. (1)

Lexical notes
– yanšud: pronounced with fatḥah on the initial yāʾ, a silent nūn, and ḍamma on the shīn. The verb nashada al-ḍāllah means “to look for a lost item and ask about it,” and, by extension, “to announce it.” The same form appears in the other narration.
– ḍāllah: anything that has gone astray; plural ḍawāll. Al-Miṣbāḥ states that ḍāllah, with the final hāʾ, applies to both the masculine and the feminine, and its plural is ḍawāll. For inanimate property the terms ḍāʾiʿah or luqṭah are used; ḍāllah is confined to animals.
– “May Allah never return it to you”: a supplication for the opposite of what the announcer seeks, classed as a form of disciplinary reprimand (taʿzīr).

Points derived from the ḥadīth
1 – Anyone who hears a person in the mosque announcing a lost animal should openly supplicate against him by saying, “May Allah not restore it to you,” for mosques were not built for that purpose.
2 – The ruling is general: whether the lost object is an animal, merchandise, money, or anything else, the common denominator is that mosques were not erected for such matters.
3 – The ḥadīth proves that announcing a lost item in the mosque is prohibited and that uttering this supplication against the announcer is obligatory.