It’s fun to get back to reading the gospels after slogging through Leviticus. That said, a reason to read Leviticus is right there in John 1.

On the next day, he saw Jesus coming to him and said, “Behold, the Lamb of God who takes away the sin of the world!” (John 1.29, LSB)

We have to cut through a lot of detail in Leviticus, some of which doesn’t appear relevant, but one thing is relevant: a sacrificed lamb or other animal was required to take away sin.

For the life of the flesh is in the blood, and I have given it to you on the altar to make atonement for your souls; for it is the blood that makes atonement by the life. (Leviticus 17.11, LSB)

If you knew nothing about the Old Testament, John the Baptist’s sentence wouldn’t have made any sense.

But when Christ appeared as a high priest of the good things to come, He entered through the greater and more perfect tabernacle, not made with hands, that is to say, not of this creation, and not through the blood of goats and calves, but through His own blood, He entered the holy places once for all, having obtained eternal redemption. For if the blood of goats and bulls and the ashes of a heifer sprinkling those who have been defiled sanctify for the cleansing of the flesh, how much more will the blood of Christ, who through the eternal Spirit offered Himself without blemish to God, cleanse your conscience from dead works to serve the living God? (Hebrews 9.11 – 14, LSB)