Gen 3:15, Heb 9:7-8, Heb 10:19-20, Heb 10:14
By dying on the cross, Jesus completed the work of Christ prophesied in the Old Testament. (Gen 3:15)
Gen 3:15 And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.
When Jesus died, the veil in the sanctuary was torn. (Lk 23:44-46)
Lk 23:44 And it was about the sixth hour, and there was a darkness over all the earth until the ninth hour. 45 And the sun was darkened, and the veil of the temple was rent in the midst. 46 And when Jesus had cried with a loud voice, he said, Father, into thy hands I commend my spirit: and having said thus, he gave up the ghost.
In the Old Testament the veil of the sanctuary was always closed. (Heb 9:7-8)
Heb 9:7 But into the second went the high priest alone once every year, not without blood, which he offered for himself, and for the errors of the people: 8 The Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest, while as the first tabernacle was yet standing:
However, Jesus tore His body on the cross for forgiveness of our sins and opened the way to meet God. (Heb 10:14,19-20)
Heb 10:14 For by one offering he hath perfected for ever them that are sanctified. 19 Having therefore, brethren, boldness to enter into the holiest by the blood of Jesus, 20 By a new and living way, which he hath consecrated for us, through the veil, that is to say, his flesh;