The Book of Jihad and Expeditions
وَحَدَّثَنِي حَجَّاجُ بْنُ الشَّاعِرِ، حَدَّثَنَا عَبْدُ الصَّمَدِ، حَدَّثَنَا حَمَّادٌ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَقُولُ يَوْمَ أُحُدٍ " اللَّهُمَّ إِنَّكَ إِنْ تَشَأْ لاَ تُعْبَدْ فِي الأَرْضِ " .It is narrated on the authority of Anas that the Messenger of Allah (ﷺ) said on the day of the Battle of Uhud:O Allah, if Thou wilt (defeat Muslims), there will be none on the earth to worship Thee
From Sahih Muslim, whose reports the scholars accept as authentic.