ציטירנדיקער פּירוש אויף דברי הימים א 16:16

When you review this whole paragraph starting with the words ואם לא תשמעו in verse 14 until the conclusion of verse 43, you will find that it contains 390 words. This is the total number of years that the tribes sinned in the land of Israel prior to heir being exiled. The period commenced with the declaration in Samuel II 20,1: “we do not have a share in David nor a common inheritance with the son of Yishai.” [This was Sheva ben Bichri’s call to rebellion against the Kingdom of David and occurred during the last years of David’s reign. Ed.] You will find that in Chronicles I 16,16 the word יצחק in the reference to ושבועתו ליצחק, is spelled with the letter ש instead of the letter צ, thus hinting at 390 years after which that oath that the land of Canaan would belong to the descendants of Yitzchak might expire. [The commonly accepted text of the Bible does not show that letter ש, though I have found that in Cassel’s version of comparative spellings in the Bible it is given as an alternate spelling. Ed.] It is assumed that G’d had sworn to Yitzchak that if his descendants would not sin for more than 390 years He would not decree exile for them. This is also alluded to in Ezekiel 4,5-6: “and I will impose upon you 390 days (years), corresponding to the days of their guilt; and so you shall bear the guilt for the House of Israel. When you have completed these, you shall lie another forty years on your right side, and bear the guilt of the House of Yehudah. One day for each year I impose upon you.”