Kabbalah zu Ijow 38:1

And on it rode Elijah, and was taken to heaven, as it is written: "And Elijah went up to heaven in a whirlwind" (II Kings 2:11). And on it [Yov was answered] And Y"HVH answered Job from the whirlwind. And because of this the rabbis taught in the Mishnah: "who is strong? The one who conquers their impulses" (Avot 4:1). And there are those who are able to beautify their donkey, and it does not upset its rider. In that sense it is written about Avraham "and he saddled his donkey" (Genesis 22:3). And regarding the Mashiach it is said: "A poor person, riding on a donkey" (Zechariah 9:9).