The Book on Government
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا هُشَيْمٌ، عَنْ دَاوُدَ بْنِ أَبِي هِنْدٍ، عَنْ أَبِي عُثْمَانَ، عَنْ سَعْدِ بْنِ أَبِي وَقَّاصٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ يَزَالُ أَهْلُ الْغَرْبِ ظَاهِرِينَ عَلَى الْحَقِّ حَتَّى تَقُومَ السَّاعَةُ " .It has been narrated by Sa'd b. Abu Waqqas that the Messenger of Allah (ﷺ) said:The people of the West will continue to triumphantly follow the truth until the Hour is established
From Sahih Muslim, whose reports the scholars accept as authentic.