Virtues and Merits of the Prophet (pbuh) and his Companions
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، قَالَ أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " الْخَيْلُ فِي نَوَاصِيهَا الْخَيْرُ إِلَى يَوْمِ الْقِيَامَةِ ".Narrated Ibn `Umar:Allah's Messenger (ﷺ) said, "There is always goodness in horses till the Day of Resurrection
From Sahih al-Bukhari, whose reports the scholars accept as authentic.