John Gill Commentary 2 Chronicles 31

Now when all this was finished
The temple cleansed, the priests and Levites sanctified, the passover and feast of unleavened bread observed, and other seven days of rejoicing kept:

all Israel that were present went out to the cities of Judah, and broke
the images in pieces, and cut down the groves, and threw down the high
places and the altars out of all Judah and Benjamin ;
which had been erected by Ahaz, (2 Chronicles 28:2 2 Chronicles 28:25) at or about this time also the brazen serpent was broke to pieces, (2 Kings 18:4) ,

in Ephraim also and Manasseh, until they had utterly destroyed them
all ;
which must be understood of such cities in those tribes that had been taken in former times by the kings of Judah from the kings of Israel; or such as were now in the hands of the Assyrians, who might not concern themselves in matters of religion; or this might be done at the connivance of Hoshea king of Israel, who had no regard to any other idolatry than the worship of the calves; and besides, having met with trouble from the Assyrians, and fearing more, might be willing to have his kingdom cleared of idolatry, in hope the divine displeasure would be removed:

then all the children of Israel returned every man to his possession
into their own cities ;
and not till then, when all monuments of idolatry were removed.

And Hezekiah appointed the courses of the priests, and the
Levites after their courses
As they were fixed by David, and were in the times of Jehoshaphat, and had been since interrupted, and which Hezekiah now restored, and placed them in their regular order:

every man according to his service, the priests and Levites for
burnt offerings, and for peace offerings, to minister and to give
thanks, and to praise in the gates of the tents of the Lord ;
or camp of the Lord, where they were posted, and lay as an host encamped, to keep the watch of the house of the Lord; the priests, they were appointed to offer the sacrifices of every sort; the Levites to minister to them in what they needed and required of them, and others of them to be singers in time of service, and others to be porters at the gate.

He appointed also the king's portion of his substance
Out of his own treasury, of his royal bounty, over and above what was usual for kings to give for their own sacrifices, the treasury of the temple being exhausted, and the people being brought into low circumstances in the last reign:

for the burnt offerings, [to wit], for the morning and evening
burnt offerings ;
the daily sacrifice offered morning and evening, which had been neglected, but now revived:

and the burnt offerings for the sabbaths, and for the new moons, and
for the set feasts ;
when beside the daily sacrifice there were additional ones: as it is written in the law of the Lord; in (Numbers 28:9–29:40) .

Moreover, he commanded the people that dwelt in Jerusalem to give the portion of the priests and the Levites What was assigned unto them by the law of God by tithes, firstfruits

that they might be encouraged in the law of the Lord ; in the study of it; that they might gain greater knowledge of it themselves, and be better able to instruct the people, which of late had been much neglected; and that they might be more at leisure for such service, and be free from all worldly business, care, and distraction of mind, was the design of this edict.

And as soon as the commandment came abroad
Not only was published in the city of Jerusalem, but the report of it, or rather that itself, was spread throughout the cities of Judah:

the children of Israel brought in abundance the firstfruits of corn,
wine, and oil, and honey ;
the three first of these are expressed in the law, (Deuteronomy 18:4) but not honey; wherefore the Targum here, and the Jewish writers in general, interpret it of the "dubsa" of the palm tree, as they call it, the fruit and liquor of that, which is of a sweet taste, and which the Scenite Arabs called "dabusa", as Pliny ^F23 from Juba relates; for so it should be read, and not "dabulan" or "dablan", as in some copies: but though honey was forbid to be used in sacrifice, it was not forbidden to be eaten; and as the land of Judea abounded with honey, properly so called, the priests might have the firstfruits of that as of other liquors; (See Gill on Deuteronomy 8:8),

and of all the increase of the field ;
of the trees of it, vines, fig trees, pomegranates as Kimchi;

and the tithe of all things ;
even of herbs, as the same writer, and so the Talmud ^F24 , which were free from tithes by the law, see (Matthew 23:23) ,

brought they in abundantly ;
even of all that their vineyards, oliveyards, and fields produced.

FOOTNOTES:

• F23: Nat. Hist. l. 13. c. 4.
• F24: T. Bab. Nedarim, fol. 55. 1.