'It is I' in the Bible

It is in the power of my hand, to deal with thee for harm, - but the God of your father, last night, spake unto me, saying, Take heed to thyself that thou speak not with Jacob, either good or bad.

So he said unto his brethren My silver hath been returned, yea verily, there it is in my sack! Then went forth their heart and they turned trembling - each man unto his brother saying. Wharf is this that God hath done to us?