Now the feast of unleavened bread drew nigh, which is called the Passover.
And the chief priests and scribes sought how they might kill him; for they feared the people.
Then entered Satan into Judas surnamed Iscariot, being of the number of the twelve.
And he went his way, and communed with the chief priests and captains, how he might betray him unto them.
And they were glad, and covenanted to give him money.
And he promised, and sought opportunity to betray him unto them in the absence of the multitude.
Then came the day of unleavened bread, when the passover must be killed.
Although this whole passage is of utmost importance, remember the last line where according to the Old Testament the lamb had to be slaughtered and his blood painted over the doorways to save the children of God.