In this article, we considered the biblical basis of the Church's teaching on the Immaculate Conception. The Catholic Church proceeds from the biblical concept of «kekharitomen» (гр.), which formed the basis of the teaching about this glorious Marian dogma. In this work, the linguistic sources of this term were presented, which shed light on the actions of the Holy Spirit, Who, erring over all creation with the will of the Father through the Son, being their common personal Love, creates Mary as a new Creation. In Eph 1, 6 St. Paul speaks of our justification through the will of the Father by grace in His beloved Son Jesus Christ. The Apostle of the Nations uses the verb «kharito» (гр.), which means that the Mother of God was justified in advance thanks to the anticipatory action of the Holy Spirit with the will of the Son and the Father. God would not be omnipotent if He did not protect His Mother from the sin of the ancestors. That is why, thanks to the future Incarnation, He forbids the Most Pure One from original sin in an anticipatory way, so that through Her He may take the body and redeem the whole world on the Cross. This work should become a bridge between Catholics, Orthodox and Protestants, who should look at Christ in a new way through the prism of Mary's perfect holiness from the Conception.