(155) باب الدُّعَاءِ فِي الصَّلاَةِ
Narrated AbuLayla al-Ansari:
I prayed by the side of the Messenger of Allah (ﷺ) in the supererogatory prayer and I heard him say: "I refuge in Allah from the Hell-Fire; woe to the inmates of the Hell-fire!"
Reference: Sunan Abi Dawud 881
In-book reference: Book 2, Hadith 491
English translation: Book 3, Hadith 880