OT-PROPHET.filter - acv firstborn:

acv@Isaiah:14:30 @ And the firstborn of the poor shall feed, and the needy shall lie down in safety. And I will kill thy root with famine, and thy remnant shall be slain.

acv@Jeremiah:31:9 @ They shall come with weeping. And I will lead them with supplications. I will cause them to walk by rivers of waters, in a straight way in which they shall not stumble. For I am a father to Israel, and Ephraim is my firstborn.