'Myself' in the Bible

Take your rest here tonight; and in the morning, if he will do for you what it is right for a relation to do, very well, let him do so: but if he will not, then by the living Lord I myself will do so.

And it was in my mind to give you the chance of taking it, with the approval of those seated here and of the responsible men of my people. If you are ready to do what it is right for a relation to do, then do it: but if you will not do it, say so to me now; for there is no one who has the right to do it but you, and after you myself. And he said, I will do it.

And the near relation said, I am not able to do the relation's part, for fear of damaging the heritage I have: you may do it in my place, for I am not able to do it myself.