The Passover was a type of Christ (1 Cor. 5:7). Christ was made the Lamb of God that God may pass over us, the sinners, as portrayed in type by the Passover in Exo. 12. For the fulfillment of the type, Christ as the Passover lamb had to be killed on the day of the Passover.
In the type, during the four days preceding the day of the Passover, the Passover lamb had to be examined in relation to its perfection (Exo. 12:3-6). Before His crucifixion Christ came to Jerusalem for the last time, six days before the Passover (John 12:1), and likewise was examined by the Jewish leaders for a few days (Matt. 21:23-46; 22:1-46). No blemish was found in Him, and He was proved to be perfect and qualified to be the Passover lamb for us. See note Mark 12:371.