The Prophet ﷺ said, "Whoever enters a horse between two horses, meaning without any assurance that it will win, that is not gambling. But whoever enters a horse between two horses when it is assured of winning, that is gambling."
حدثنا محمود بن خالد حدثنا الوليد بن مسلم عن سعيد بن بشير عن الزهري بإسناد عباد ومعناه