on the horses # 12_2KI_09_33 # And he said, Throw her down. So they threw her down: and [some] of her blood was sprinkled on the wall, and on the horses: and he trode her under foot. 
upon the horses # 02_EXO_09_03 # Behold, the hand of the LORD is upon thy cattle which [is] in the field, upon the horses, upon the asses, upon the camels, upon the oxen, and upon the sheep: [there shall be] a very grievous murrain.