that the Prophet (ﷺ) said: "There are seven gates of Jahannam: Among them a gate for whoever carries a sword against my Ummah." Or he said: "Against the Ummah of Muhammad."
Jami` at-Tirmidhi Book 47, Hadith 175
← Previous Hadith "There was a woman who performed Salat behind the Messenger of Allah (ﷺ) who was the most beautiful among the people. Some of the people would go forward to the first line so as not to see her. Others would go back to the last line so when he would bow, he could look at her from under his armpit. So Allah revealed: Indeed We know those who try to come forward among you, and We know those who try to go back (15:24).

Jami` at-Tirmidhi Book 47, Hadith 174 Next Hadith → that the Messenger of Allah (ﷺ) said: "Al-Hamdulillah is Umm Al-Qur'an and Umm Al-Kitab and the seven oft-repeated."

Jami` at-Tirmidhi Book 47, Hadith 176