C. F. Keil and Franz Delitzsch on 1 Kings 5:1

1Ki 5:1 Solomon’s negotiations with Hiram of Tyre. - 1Ki 5:1. When king Hiram of Tyre heard that Solomon had been anointed king in the place of David, he sent his servants, i.e., an embassage, to Solomon, to congratulate him (as the Syriac correctly explains) on his ascent of the throne, because he had been a friend of David the whole time (כּל־הימים, i.e., as long as both of them David and Hiram were kings). On Hiram and the length of his reign, see the remarks on 2Sa 5:11. This is passed over in the Chronicles as having no essential bearing upon the building of the temple.