John Gill Commentary 2 Chronicles 14

So Abijah slept with his fathers ,
(1 Kings 15:8)

and Asa his son reigned in his stead; in his days the land was quiet
ten years ;
the Targum is, the land of Israel; but much better the Septuagint, the land of Judah; these ten years, in which it had rest from war, were the first three years of Asa's reign, and the first seven of Baasha's, according to Jarchi, and which seems right; after which there was war between them all their days, see (1 Kings 15:32 1 Kings 15:33) .

And Asa did that which was good and right
See (1 Kings 15:11) .

For he took away the altars of the strange gods
Or of a strange people, of the Zidonians, Ammonites, and Moabites, which had remained from the times of Solomon, and which he built for his wives, (1 Kings 11:7 1 Kings 11:8)

and the high places ;
built for idols; for as for those on which the true God was worshipped, they were not removed in his days, (1 Kings 15:14)

and brake down the images :
or statues, or pillars, erected to the honour of idols, and on which the images of them were placed:

and cut down the groves ;
in the midst of which they stood.

And commanded Judah to seek the Lord God of their fathers
To pray to him, and him only, and attend his worship and service; this he did by a public edict:

and to do the law and the commandment :
to observe all the laws of God, moral, ceremonial, and civil.

Also he took away out of all the cities of Judah the high
places and the images
Perhaps the high places in (2 Chronicles 14:3) design only the high places and altars in Jerusalem, and near it; these in all the rest of the cities of the land; the "images were", as the word signifies, "sun images", either made in the form of the sun, or dedicated to it, or temples for it; (See Gill on Leviticus 26:30),

and the kingdom was quiet before him ;
he had no foreign enemy to molest him, and so took that opportunity to reform divine worship, and in that he met with no opposition from his people.