'It is I' in the Bible

For it is impossible that those who have once been enlightened, and have tasted of the heavenly gift, and been make partakers of the Holy Spirit,

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

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

But without faith it is impossible to please him; for he that cometh to God must believe that he is, and that he is a rewarder of those who diligently seek him.