'Hereby' in the Bible

Then the king summoned Ziba, Saul's attendant, and said to him, "Everything that belonged to Saul and to his entire house I hereby give to your master's grandson.

Then the king said to Joab, “I hereby grant this request. Go, bring back the young man Absalom.”

The king said to Ziba, "Look, all that [was] Mephibosheth's is yours." Ziba said, "I hereby do obeisance; may I find favor in your eyes, my lord the king."

The king said to him, “Why keep on speaking about these matters of yours? I hereby declare: you and Ziba are to divide the land.”

All of this Araunah hereby gives to the king." Then Araunah said to the king, "May Yahweh your God respond favorably for you."