Sayyiduna Abdullah bin Amr (may Allah be pleased with him) says: the Prophet (peace and blessings be upon him) commanded a man to lead the people in the Zuhr prayer. While leading the people in prayer, that man spat towards the qiblah. When the time of the Asr prayer came, the Prophet (peace and blessings be upon him) sent word to another man (to lead the prayer). The first man became fearful; he came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah! Has something been revealed about me?" the Prophet (peace and blessings be upon him) said: "No! But you spat in front of you while you were leading the people, and so you have harmed Allah Almighty and His angels."
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2011