2 Chronicles 30:5
So they established a decree to make proclamation throughout all Israel, from Beer–sheba even to Dan, that they should come to keep the passover unto the Lord God of Israel at Jerusalem: for they had not done it of a long time in such sort as it was written.
Cross-reference
In 2 Chronicles 35:18, Josiah's Passover is also celebrated uniquely — both revive the feast after neglect.
In Leviticus 23:2, the Lord commands proclaiming appointed feasts — this gives the authority for the Passover proclamation here.
In Judges 20:1, the same geographic expression 'from Dan to Beersheba' describes all Israel gathering — a direct verbal parallel.
In Leviticus 23:4, the feasts are to be proclaimed at their appointed times — matching Hezekiah's decree to keep the Passover.
1 Chronicles 21:2 uses the same 'from Beersheba to Dan' phrase for David's census — a different purpose but same territorial scope.
In Exodus 32:5, Aaron proclaims a feast to the LORD but for an idol — contrasting with Hezekiah's true Passover proclamation.