'Here I Am' in the Bible

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.