SEV Biblia, Chapter 23:23
A los dieciocho años del rey Josías fue hecha aquella pascua al SEÑOR en Jerusalén.
John Gill's Bible Commentary
Ver. 23. But in the eighteenth year of king Josiah, wherein this passover was holden to the Lord in Jerusalem .] This shows that Josiah must begin the reformation very early that year, since he did all that is before recorded in this and the preceding chapter by the fourteenth of Nisan, the day on which the passover was kept, which month answers to part of our March and part of April, (see 2 Kings 22:3) and was the same year the repairs of the temple were finished.
Matthew Henry Commentary
Verses 15-24 - Josiah's zeal extended to the cities of Israel within his reach. He carefully preserved the sepulchre of that man of God, who came from Judah to foretell the throwing down of Jeroboam's altar. When they ha cleared the country of the old leaven of idolatry, then they applie themselves to the keeping of the feast. There was not holden such passover in any of the foregoing reigns. The revival of long-neglected ordinance, filled them with holy joy; and God recompensed their zeal in destroying idolatry with uncommon tokens of his presence and favour. We have reason to think that during the remainder of Josiah's reign, religion flourished.
Original Hebrew
כי 3588 אם 518 בשׁמנה 8083 עשׂרה 6240 שׁנה 8141 למלך 4428 יאשׁיהו 2977 נעשׂה 6213 הפסח 6453 הזה 2088 ליהוה 3068 בירושׁלם׃ 3389