Remove the old yeast ⌞of sin⌟ so that you may be a new batch of dough, since you don’t actually have the yeast ⌞of sin⌟. Christ, our Passover lamb, has been sacrificed.
For seven days you must eat unleavened bread. On the very first day you must remove any yeast that you have in your houses. Whoever eats anything with yeast in it from the first day through the seventh day must be excluded from Israel.
He used another illustration. “The kingdom of heaven is like yeast that a woman mixed into a large amount of flour until the yeast worked its way through all the dough.”
Killing the Passover lamb was customary on the first day of the Festival of Unleavened Bread. The disciples asked Jesus, “Where do you want us to prepare the Passover meal for you?”
God showed that Christ is the throne of mercy where God’s approval is given through faith in Christ’s blood. In his patience God waited to deal with sins committed in the past.