Humans and donkeys have something very important in common, according to the words of God: Both have to be redeemed by the blood of a lamb. The purpose of the memorial of Unleavened Bread is to remind us those who trust God have crossed over and what was before is destroyed and is gone. The past is destroyed just as the Egyptian army was drowned into the Sea.
When we accepted Yeshua as our Savior, we chose Him as our first-born. We have made Him first in our hearts.