Say to Amasa: this picks up from verse 11, where David is speaking to Zadok and Abiathar, but what follows is a separate message to a different person, Amasa. As such it is quite apart from the message to the leaders of Judah in general. In many languages it will be wise to fill out the information implied in the English imperative verb say. This will mean translating something like Good News Translation, “David also told them to say to Amasa” or, making it even more precise, “In addition to this, David instructed Zadok and Abiathar to say to Amasa….”
My bone and my flesh: see the comments in the previous verse on this expression. While the form of a question is used, the intent is to make a strong affirmation of kinship. In many languages it will be better to render the question by a simple statement of fact. Since Joab was also a relative of David, the translation must not imply that Amasa is a relative and that Joab is not.
God do so to me, and more also …: on this oath formula see 3.9, 35; 1 Sam 3.17. Compare also Ruth 1.17. David is making a very solemn promise to Amasa that he would become the commander of the army, replacing Joab. Amasa had been the head of Absalom’s army (17.25), and his nomination to head David’s army is an attempt at reconciliation between the opposing forces. It is perhaps also a way of punishing Joab for his part in the death of Absalom.
The word translated henceforth is more literally “all the days,” and this gives the idea of a permanent position. Other translations are “from now on” (New Revised Standard Version), “permanently” (New American Bible), and “the rest of your life” (Revised English Bible).
Quoted with permission from Omanson, Roger L. and Ellington, John E. A Handbook on the First and Second Books of Samuel, Volume 2. (UBS Helps for Translators). New York: UBS, 2001. For this and other handbooks for translators see here .
