'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 donkey have I taken? or whom have I defrauded? whom have I oppressed? or of whose hand have I received any bribe to blind my eyes with? and I will restore it to you.

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