John Gill Commentary 2 Kings 22:20

"Therefore, behold, I will gather thee to thy fathers, and thou shalt be gathered to thy grave in peace, neither shall thine eyes see all the evil which I will bring upon this place. And they brought the king word again." — 2 Kings 22:20 (ASV)

Behold therefore, I will gather thee unto thy fathers
To his godly ancestors, to share with them in eternal life and happiness; otherwise it could be no peculiar favour to die in common, as his fathers did, and be buried in their sepulchres:

and thou shall be gathered into thy grave in peace ;
in a time of public peace and tranquillity; for though he was slain in battle with the king of Egypt, yet it was what he was personally concerned in, and it was not a public war between the two kingdoms, and his body was carried off by his servants, and was peaceably interred in the sepulchre of his ancestors, (2 Kings 23:29 2 Kings 23:30) , as well as he died in spiritual peace, and entered into eternal peace, which is the end of the perfect and upright man, as he was, (Psalms 37:37) but this chiefly regards his not living to be distressed with the calamities of his nation and people, as follows:

and thine eyes shall not see all the evil which I will bring upon this
place :
he being removed first, though it came upon it in the days of his sons:

and they brought the king word again ;
of what Huldah the prophetess had said unto them.