2 Kings 17:9

The sons of Israel did things secretly which were not right against the Lord their God. Moreover, they built for themselves high places in all their towns, from watchtower to fortified city.

2 Kings 18:8

He defeated the Philistines as far as Gaza and its territory, from watchtower to fortified city.

Deuteronomy 13:6

If your brother, your mother’s son, or your son or daughter, or the wife you cherish, or your friend who is as your own soul, entice you secretly, saying, ‘Let us go and serve other gods’ (whom neither you nor your fathers have known,

Deuteronomy 27:15

‘Cursed is the man who makes an idol or a molten image, an abomination to the Lord, the work of the hands of the craftsman, and sets it up in secret.’ And all the people shall answer and say, ‘Amen.’

Job 31:27

And my heart became secretly enticed,
And my hand threw a kiss from my mouth,

Ezekiel 8:12

Then He said to me, “Son of man, do you see what the elders of the house of Israel are committing in the dark, each man in the room of his carved images? For they say, ‘The Lord does not see us; the Lord has forsaken the land.’”

Hosea 12:11

Is there iniquity in Gilead?
Surely they are worthless.
In Gilgal they sacrifice bulls,
Yes, their altars are like the stone heaps
Beside the furrows of the field.

Treasury of Scripture Knowledge

Summary

And the children of Israel did secretly those things that were not right against the LORD their God, and they built them high places in all their cities, from the tower of the watchmen to the fenced city.

From the tower

Bible References

Secretly

Deuteronomy 13:6
If your brother, your mother’s son, or your son or daughter, or the wife you cherish, or your friend who is as your own soul, entice you secretly, saying, ‘Let us go and serve other gods’ (whom neither you nor your fathers have known,
Deuteronomy 27:15
‘Cursed is the man who makes an idol or a molten image, an abomination to the Lord, the work of the hands of the craftsman, and sets it up in secret.’ And all the people shall answer and say, ‘Amen.’
Job 31:27
And my heart became secretly enticed,
And my hand threw a kiss from my mouth,
Ezekiel 8:12
Then He said to me, “Son of man, do you see what the elders of the house of Israel are committing in the dark, each man in the room of his carved images? For they say, ‘The Lord does not see us; the Lord has forsaken the land.’”

From the tower

2 Kings 18:8
He defeated the Philistines as far as Gaza and its territory, from watchtower to fortified city.
Hosea 12:11
Is there iniquity in Gilead?
Surely they are worthless.
In Gilgal they sacrifice bulls,
Yes, their altars are like the stone heaps
Beside the furrows of the field.