This is the fourth book of the Injil Sharif. The first three books of the Injil present the life and public teachings of Isa the Messiah, in which he proclaims the Good News, namely that Allah offers all people forgiveness of sins, the gift of the Holy Spirit, and eternal life in his glorious kingdom (Paradise). As for this fourth book, it assumes its readers are familiar with the life and public teaching of our Lord Isa, and it presents what he did and taught privately with his disciples. He explained to them who he really is, and he made it clear to them that those who accept him with all their heart as their Lord and Savior are born anew in a spiritual rebirth from Allah's Holy Spirit, which makes them become fit for Allah's eternal Kingdom.