Abu al-Tahir Ahmad ibn 'Amr narrated to us: Ibn Wahb narrated to us, from Haywah, from Muhammad ibn 'Abd al-Rahman, from Abu 'Abd Allah, the freed slave of Shaddad ibn al-Had, that he heard Abu Hurayrah say: The Messenger of Allah, peace and blessings be upon him, said: "Whoever hears a man announcing a lost item in the mosque, let him say: 'May Allah not return it to you,' for the mosques were not built for this."