The Book of Clothes and Adornment
حَدَّثَنِي سَلَمَةُ بْنُ شَبِيبٍ، حَدَّثَنَا الْحَسَنُ بْنُ أَعْيَنَ، حَدَّثَنَا مَعْقِلٌ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ فِي غَزْوَةٍ غَزَوْنَاهَا " اسْتَكْثِرُوا مِنَ النِّعَالِ فَإِنَّ الرَّجُلَ لاَ يَزَالُ رَاكِبًا مَا انْتَعَلَ " .Jabir reported:I heard Allah's Apostle (ﷺ) saying during an expedition in which we also participated: Make a general practice of wearing sandals, for a man is riding as it were when he wears sandals
From Sahih Muslim, whose reports the scholars accept as authentic.