2 Kings 15:35

Only the high places were not removed; the people still [were] sacrificing and offering incense on the high places. He built the upper gate of the temple of Yahweh.

2 Kings 12:3

Only the high places were not removed; the people [were] still making sacrifices and offering incense on the high places.

2 Chronicles 23:20

And he took the commanders of hundreds, the noblemen, the governors over the people, and all the people of the land, and they brought the king down from the house of Yahweh. And they came through the upper gate [to] the house of the king, and they set the king upon the throne of the kingdom.

2 Kings 15:4

Only he did not remove the high places; the people [were] still sacrificing and burning incense on the high places.

2 Kings 18:4

He removed the high places, and he smashed the stone pillars; he cut down the poles of Asherah worship and demolished the bronze serpent which Moses had made, for up to those days the {Israelites} were offering incense to it and called it Nehushtan.

2 Chronicles 27:3-9

He built the upper gate of the house of Yahweh, and {he did much restoration} on the wall of Ophel.

2 Chronicles 32:12

Has not Hezekiah himself removed his high places and his altars and said to Judah and to Jerusalem, saying, "You must bow down before one altar and upon it you must make offerings"?

Treasury of Scripture Knowledge

Summary

Howbeit the high places were not removed: the people sacrificed and burned incense still in the high places. He built the higher gate of the house of the LORD.

The higher gate

Bible References

Howbeit

2 Kings 15:4
Only he did not remove the high places; the people [were] still sacrificing and burning incense on the high places.
2 Kings 18:4
He removed the high places, and he smashed the stone pillars; he cut down the poles of Asherah worship and demolished the bronze serpent which Moses had made, for up to those days the {Israelites} were offering incense to it and called it Nehushtan.
2 Chronicles 32:12
Has not Hezekiah himself removed his high places and his altars and said to Judah and to Jerusalem, saying, "You must bow down before one altar and upon it you must make offerings"?

The higher gate

2 Chronicles 27:3
He built the upper gate of the house of Yahweh, and {he did much restoration} on the wall of Ophel.