12 Jonathan said to David, "Yahweh, the God of Israel, (be witness): when I have sounded my father about this time tomorrow, (or) the third day, behold, if there be good toward David, shall I not then send to you, and disclose it to you?
*Minor differences ignored. Grouped by changes, with first version listed as example.
Jonathan said - O Lord God of Israel - There is, most evidently, something wanting in this verse. The Septuagint has, The Lord God of Israel doth Know. The Syriac and Arabic, The Lord God of Israel is Witness. Either of these makes a good sense. But two of Dr. Kennicott's MSS. supply the word חי chai, "liveth;" and the text reads thus, As the Lord God of Israel Liveth, when I have sounded my father - if there be good, and I then send not unto thee, and show it thee, the Lord do so and much more to Jonathan. This makes a still better sense.
And Jonathan said unto David, O Lord God of Israel,.... Or by the Lord God of Israel, I swear unto thee; for this is the form of the oath, as Jarchi and Kimchi observe:
when I have sounded my father about tomorrow any time, or the third day; searched, inquired, and found out how his disposition is:
and, behold, if there be good toward David; if he is well disposed to him, as may appear by speaking respectfully of him, or kindly inquiring after him, and by being satisfied with the account given him:
and I then send not unto thee, and show it thee; then let the vengeance of God fall upon me in some remarkable manner or another, as follows; or "shall I not then send unto thee, and show it thee" (t)? certainly I will; that is, I will send a messenger to thee to acquaint thee with it, who shall tell it, and cause thee to hear it, as from myself.
(t) "an non tune mitterem?" Junius & Tremellius; "nonne tunc mittam ad te?" so some in Vatablus.
In the field, where they were both entirely free from observation, Jonathan first of all renewed his covenant with David, by vowing to him on oath that he would give him information of his father's feelings towards him (1-Samuel 20:12, 1-Samuel 20:13); and then entreated him, with a certain presentiment that David would one day be king, even then to maintain his love towards him and his family for ever (1-Samuel 20:14-16); and lastly, he made David swear again concerning his love (1-Samuel 20:17), and then gave him the sign by which he would communicate the promised information (1-Samuel 20:18-23).
O Lord God - Do thou hear and judge between us. It is an abrupt speech which is usual in great passions.
*More commentary available at chapter level.