So you can picture Jesus passing a bud to His disciples since it's just a glass of alcohol?
Leaven is a type of sin.
God sternly warns His people to clean the house of ALL leaven for the Passover. He did not make exception for beverages.
This is what was commanded just prior to the LORD smiting all of the first born throughout Egypt.
Exodus 12:15, 18, 19, 20,
15
Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
18
In the first month, on the fourteenth day of the month at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.
19Seven days shall there be no leaven found in your houses: for whosoever eateth that which is leavened, even that soul shall be cut off from the congregation of Israel, whether he be a stranger, or born in the land. 20Ye shall eat nothing leavened; in all your habitations shall ye eat unleavened bread.
If you were in their shoes, would you say, naaaaw God just doesn't want the bread to rise?
Let's open that leavened bottle of fermented wine that I've been saving for a special occasion!