Muwatta Malik 1004
موطأ مالك#1004Sahihوَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم رُئِيَ وَهُوَ يَمْسَحُ وَجْهَ فَرَسِهِ بِرِدَائِهِ فَسُئِلَ عَنْ ذَلِكَ فَقَالَ " إِنِّي عُوتِبْتُ اللَّيْلَةَ فِي الْخَيْلِ " .
Yahya related to me from Malik from Yahya ibn Said that the Messenger of Allah, may Allah bless him and grant him peace, was seen wiping the face of his horse with his cloak. He was questioned about it and said, "I was reproached in the night about horses." i.e. not taking care of them
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 21:46