The Messenger of Allah ﷺ said, "Begin with the horses on the day they come to drink."
حدثنا إبراهيم بن المنذر الحزامي أنبأنا أبو الجعد عبد الرحمن بن عبد الله
قال رسول الله ﷺ يبدأ بالخيل يوم وردها
No references are available.
[Its isnad is extremely daif]. Busiri graded it daif. See hadith no. 165 regarding the status of Kathir bin Abdullah Awfi Muzani, and it has another defect as well.