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
But when it descends in their territory, then evil is the morning of those who were warned.
فَإِذَا نَزَلَ بِسَاحَتِهِمْ 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}
Request/Fix translation
"الله أكبَرُ خَرِبتْ خَيبر إِنَّا إذا نَزَلنَا بِسَاحَة قَوْم فَسَاءَ صَبَاحُ المنذَرِينَ ".