'Here I Am' in the Bible

And the angel of Jehovah called unto him out of heaven, and said, Abraham, Abraham. And he said, Here I am.

Here I am: witness against me before Jehovah, and before his anointed: whose ox have I taken? or whose ass have I taken? or whom have I defrauded? whom have I oppressed? or of whose hand have I taken a ransom to blind mine eyes therewith? and I will restore it you.

And Saul said, Hear now, thou son of Ahitub. And he answered, Here I am, my lord.

Then shalt thou call, and Jehovah will answer; thou shalt cry, and he will say, Here I am. If thou take away from the midst of thee the yoke, the putting forth of the finger, and speaking wickedly;