'Here I Am' in the Bible

Behold, here I am: witness against me before the LORD, 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 from whose hand have I received any bribe to blind my eyes with it? and I will restore it you.

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