JSmem 8:235 :ܩܥ݂ܐ ܗܘܐ ܙܟܪܝܐ ܕܐܬ݁ܐ ܡ݁ܠܟܐ ܘܪܟܝܒ ܥܝܠܐ‏ : Zechariah had proclaimed that the king is coming mounted on a foal
See the entire entry for rkb vb. to mount