'It is I' in the Bible

and then fell away, it is impossible to renew them again to repentance; seeing they crucify the Son of God for themselves again, and put him to open shame.

that by two immutable things, in which it is impossible for God to lie, we may have a strong encouragement, who have fled for refuge to take hold of the hope set before us.

The Holy Spirit is indicating this, that the way into the Holy Place was not yet revealed while the first tabernacle was still standing;

For it is impossible that the blood of bulls and goats should take away sins.

Without faith it is impossible to be well pleasing to him, for he who comes to God must believe that he exists, and that he is a rewarder of those who seek him.