Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "If there were a hundred thousand or more people in the mosque, and then a man from the people of Hell breathed there, it would burn them all."
Al-Bazzar recorded it; its chain contains Abd al-Rahim bin Harun, who is da'if (weak). Ibn Hibban mentioned him in the book "al-Thiqat" and said: "His hadith is taken into consideration when he narrates from his written record, because when he narrates hadith from memory some munkar (objectionable) narrations are found in it." The rest of its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب صفة أهل النار / 18603