[Machine] I heard the Messenger of Allah ﷺ during a prayer that was not obligatory. He passed by mentioning the Hellfire and said, "I seek refuge in Allah from the Hellfire. Woe to the people of the Hellfire." And the wording is from the Hadith of Uthman ibn Abi Shaybah.
سَمِعْتُ رَسُولَ اللهِ ﷺ فِي صَلَاةٍ لَيْسَتْ بِفَرِيضَةٍ فَمَرَّ بِذِكْرِ النَّارِ فَقَالَ «أَعُوذُ بِاللهِ مِنَ النَّارِ وَيْلٌ لِأَهْلِ النَّارِ» وَاللَّفْظُ لِحَدِيثِ عُثْمَانَ بْنِ أَبِي شَيْبَةَ