This hadith has been transmitted on the authority of Anas b. Malik with a slight variation of words.  

لَمَّا أَتَى رَسُولُ اللَّهِ ﷺ خَيْبَرَ قَالَ إِنَّا إِذَا نَزَلْنَا بِسَاحَةِ قَوْمٍ فَسَاءَ صَبَاحُ الْمُنْذَرِينَ  

"The Messenger of Allah ﷺ prayed Fajr on the day of Khaibar during the time it was still dark, when he was near the enemy. Then he attacked them and said: 'Allahu Akbar! Khaibar is destroyed!' Twice. 'Then, when it descends in their courtyard, evil will be the morning for those who had been warned!'" [1] [1] As-Saffat 37:177  

صَلَّى رَسُولُ اللَّهِ ﷺ يَوْمَ خَيْبَرَ صَلاَةَ الصُّبْحِ بِغَلَسٍ وَهُوَ قَرِيبٌ مِنْهُمْ فَأَغَارَ عَلَيْهِمْ وَقَالَ اللَّهُ أَكْبَرُ خَرِبَتْ خَيْبَرُ مَرَّتَيْنِ إِنَّا إِذَا نَزَلْنَا بِسَاحَةِ قَوْمٍ فَسَاءَ صَبَاحُ الْمُنْذَرِينَ  

[Machine] "The fighting intensified on the day of Khaybar, and I was among the ranks of Abu Talhah. The Messenger of Allah ﷺ said, 'Allahu Akbar! Khaybar is destroyed. Whenever we descend upon a people's territory, it is a morning of distress for the warned.'"  

اشْتَدَّ الْقِتَالُ يَوْمَ خَيْبَرَ فَكُنْتُ رَدِيفَ أَبِي طَلْحَةَ فَقَالَ رَسُولُ اللَّهِ ﷺ «اللَّهُ أَكْبَرُ خَرِبَتْ خَيْبَرُ إِنَّا إِذَا نَزَلْنَا بِسَاحَةِ قَوْمٍ فَسَاءَ صَبَاحُ الْمُنْذَرِينَ»  

[Machine] The Messenger of Allah ﷺ recited the following verse when he arrived in the morning at the area of a certain tribe: "So the morning of those who were warned was not good."  

أَنَّ رَسُولَ اللهِ ﷺ لَمَّا صَبَّحَ خَيْبَرَ تَلَا هَذِهِ الْآيَةَ إِنَّا إِذَا نَزَلْنَا بِسَاحَةِ قَوْمٍ {فَسَاءَ صَبَاحُ الْمُنْذَرِينَ}  

"The Messenger of Allah ﷺ prayed Fajr on the day of Khaibar during the time it was still dark, when he was near the enemy. Then he attacked them and said: 'Allahu Akbar! Khaibar is destroyed!' Twice. 'Then, when it descends in their courtyard, evil will be the morning for those who had been warned!'" [1] [1] As-Saffat 37:177 (Using translation from Nasāʾī 547)   

صَلَّى رَسُولُ اللهِ ﷺ يَوْمَ خَيْبَرَ بِغَلَسٍ وَهُوَ قَرِيبٌ مِنْهُمْ فَأَغَارَ عَلَيْهِمْ فَقَالَ «اللهُ أَكْبَرُ خَرِبَتْ خَيْبَرُ إِنَّا إِذَا نَزَلْنَا بِسَاحَةِ قَوْمٍ فَسَاءَ صَبَاحُ الْمُنْذَرِينَ»  

"اللهُ أكبَرُ خَرِبتْ حيبرُ، اللهَ أكْبَرُ فُتِحَت خَيبَرُ، إِنا إِذَا نَزَلنَا بِقَوْمٍ فسَاءَ صَبَاحُ المَنْذَرِينَ ".  

"إِنَّا إِذا نزلنا بساحةِ قومٍ فساءَ صباحُ المُنْذَرين، قاله ﷺ ، لمَّا نزل خَبْيرَ وفتحها فقال: اللَّه أَكبرُ، خَرِبَتْ خَيْبَرُ. إِنا إِذا نزلنا الحديث".