Malik's Muwatta Book 21, Number 21.19.47:
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.
" كان النبي يمسح وجه خيله بجلبابه، و عندما سؤل لماذا يفعل هذا، أجاب: اليلة البارحة وبخني الله لنسياني خيلي" (رواه يحي بن سيد"مالك بن أنس