The first step in the re-establishment of idolatry seems to have been the restoration of the high places where Yahweh was professedly worshipped 2 Kings 18:22, but with idolatrous rites 1 Kings 14:23. The next was to re-introduce the favorite idolatry of Israel, Baal-worship, which had formerly flourished in Judaea under Athaliah 2 Kings 11:18, and Ahaz 2 Chronicles 28:2. After this, Manasseh seems to have especially affected Sabaism, which had been previously unknown in Judaea (compare 2 Kings 17:16 and note).

Worshipped all the host of heaven - Sabaism, or pure star-worship, without images, and without astrological superstitions, included a reverence for the sun, the moon, the chief stars, and the twelve signs of the Zodiac (2 Kings 23:5 note). The main worship was by altars, on which incense was burned Jeremiah 19:13. These altars were placed either upon the ground 2 Kings 21:5, or upon the house-tops 2 Kings 23:12; Zephaniah 1:5. The sun was worshipped with the face toward the east Ezekiel 8:16; chariots and horses were dedicated to him 2 Kings 23:11. The star-worship of the Jews has far more the character of an Arabian than an Assyrian or Chaldaean cult. It obtained its hold at a time when Assyria and Babylonia had but little communication with Judaea - i. e., during the reign of Manasseh. It crept in probably from the same quarter as the Molech worship, with which it is here (and in 2 Chronicles 33:3-6) conjoined.

Made a grove - He made Asherah, the Babylonian Melitta or Roman Venus. See 2 Kings 17:10, and the observations at the end of that chapter; and see here on 2 Kings 21:7 (note).

Worshipped all the host of heaven - All the stars and planets, but particularly the sun and the moon.

For he built up again the high places which Hezekiah his father had destroyed,.... The temples and altars upon them, see 2 Kings 18:4,

and he reared up altars for Baal; in the high places he rebuilt:

and made a grove, as did Ahab king of Israel: which was either an idol itself, or a shade of trees where idols were placed; or rather Asherah, rendered "a grove", is the same with Astarte, the goddess of the Zidonians, the figure of which he made and worshipped; for groves were not so soon and easily planted, raised, and made; so the same in 1 Kings 16:33.

and worshipped all the host of heaven, and served them: the sun, moon, and stars, particularly the planets Saturn, Jupiter, Mars, Mercury, and Venus.

ויּבן ויּשׁב, "he built again" the high places, which Hezekiah had destroyed (2 Kings 18:4), erected altars for Baal and an Asherah, like Ahab of Israel (1 Kings 16:32-33). האשׁרה is the image of Asherah mentioned in 2 Kings 21:7, whereas in the Chronicles the thought is generalized by the plurals לבּעלים and האשׁרות. To these two kinds of idolatry, the idolatrous bamoth and the (true) Baal-and Asherah-worship, Manasseh added as a third kind the worship of all the host of heaven, which had not occurred among the Israelites before the Assyrian era, and was probably of Assyrian or Chaldaean origin. This worship differed from the Syrophoenician star-worship, in which sun and moon were worshipped under the names of Baal and Astarte as the bearers of the male and female powers of nature, and was pure star-worship, based upon the idea of the unchangeableness of the stars in contradistinction to the perishableness of everything earthly, according to which the stars were worshipped not merely as the originators of all rise and decay in nature, but also as the leaders and regulators of sublunary things (see Movers, Phniz. i. pp. 65 and 161). This star-worship was a later development of the primary star-worship of Ssabism, in which the stars were worshipped without any image, in the open air or upon the housetops, by simple contemplation, the oldest and comparatively the purest form of deification of nature, to which the earlier Arabians and the worshippers of the sun among the Ssabians (Zabians) were addicted (cf. Delitzsch on Job 31:26-27), and which is mentioned and forbidden in Deuteronomy 4:19 and Deuteronomy 17:3. In this later form the sun had sacred chariots and horses as among the Persians (2 Kings 23:11), and incense was offered to the stars, with the face turned towards the east, upon altars which were built either upon housetops, as in the case of the Nabataeans (Strabo, xvi. 784), or within the limits of the temple in the two courts (cf. Ezekiel 8:16, also 2 Kings 21:5; 2 Kings 23:12, and 2 Chronicles 33:5; Jeremiah 19:13; Zephaniah 1:5). This burning of incense took place not merely to the sun and moon, but also to the signs of the zodiac and to all the host of heaven, i.e., to all the stars (2 Kings 23:5); by which we are no doubt to understand that the sun, moon, planets and other stars, were worshipped in conjunction with the zodiac, and with this were connected astrology, augury, and the casting of nativities, as in the case of the later so-called Chaldaeans.

(Note: Movers (Phniz. i. p. 65) correctly observes, that "in all the books of the Old Testament which are written before the Assyrian period there is no trace of any (?) star-worship; not that the Phoenician (Canaanitish) gods had not also a sidereal significance, but because this element was only a subordinate one, and the expressions, sun, moon, and stars, and all the host of heaven, which are not met with before, become for the first time common now," - although his proofs of the difference between the Assyrian star-worship and the Phoenician and Babylonian image-worship stand greatly in need of critical sifting.)

This star-worship is more minutely described in 2 Kings 21:4, 2 Kings 21:5. The two verses are closely connected. The מזבּחות וּבנה of 2 Kings 21:4 is resumed in מזב ויּבן in 2 Kings 21:5, and the יי בּבית of 2 Kings 21:4 is more minutely defined in the יי בּית חצרות בּשׁתּי of. 2 Kings 21:5. "In the two courts:" not merely in the outer court, but even in the court of the priests, which was set apart for the worship of Jehovah.

For he built up again the high places which Hezekiah his father had destroyed; and he reared up altars for Baal, and made a grove, as did Ahab king of Israel; and worshipped all the host of heaven, and served them.

21:3 He built, and c. - Trampling on the dust and affronting the memory of his worthy father. All the host of heaven - The sun, moon and stars.

21:1-9 Young persons generally desire to become their own masters, and to have early possession of riches and power. But this, for the most part, ruins their future comfort, and causes mischief to others. It is much happier when young persons are sheltered under the care of parents or guardians, till age gives experience and discretion. Though such young persons are less indulged, they will afterwards be thankful. Manasseh wrought much wickedness in the sight of the Lord, as if on purpose to provoke him to anger; he did more evil than the nations whom the Lord destroyed. Manasseh went on from bad to worse, till carried captive to Babylon. The people were ready to comply with his wishes, to obtain his favour and because it suited their depraved inclinations. In the reformation of large bodies, numbers are mere time-servers, and in temptation fall away.