Whenever Allah's Messenger (ﷺ) delivered a Khutbah (religious talk), his eyes would become red, his voice rose and his anger would become intensified, as if he (ﷺ) was like one warning an army and saying, "The enemy has made a morning attack on you. The enemy has made an evening attack on you." He (ﷺ) would also say "Amma ba'du, the best of speech is embodied in the Book of Allah, and the best of guidance is the guidance of Muhammad. And the most evil of affairs are their innovations and every innovation is misguidance." [Reported by Muslim].