2 Kings 17:33

Jehovah they are fearing, and their gods they are serving, according to the custom of the nations whence they removed them.

1 Kings 18:21

and Elijah cometh nigh unto all the people, and saith, 'Till when are ye leaping on the two branches? -- if Jehovah is God, go after Him; and if Baal, go after him;' and the people have not answered him a word.

2 Kings 17:41

and these nations are fearing Jehovah, and their graven images they have served, both their sons and their sons' sons; as their fathers did, they are doing unto this day.

Matthew 6:24

'None is able to serve two lords, for either he will hate the one and love the other, or he will hold to the one, and despise the other; ye are not able to serve God and Mammon.

Luke 16:13

'No domestic is able to serve two lords, for either the one he will hate, and the other he will love; or one he will hold to, and of the other he will be heedless; ye are not able to serve God and mammon.'

Hosea 10:2

Their heart hath been divided, now they are guilty, He doth break down their altars, He doth destroy their standing-pillars.

Zephaniah 1:5

And those bowing themselves On the roofs to the host of the heavens, And those bowing themselves, Swearing to Jehovah, and swearing by Malcham,

Treasury of Scripture Knowledge

Summary

They feared the LORD, and served their own gods, after the manner of the nations whom they carried away from thence.

General references

Bible References

They feared

2 Kings 17:41
and these nations are fearing Jehovah, and their graven images they have served, both their sons and their sons' sons; as their fathers did, they are doing unto this day.
1 Kings 18:21
and Elijah cometh nigh unto all the people, and saith, 'Till when are ye leaping on the two branches? -- if Jehovah is God, go after Him; and if Baal, go after him;' and the people have not answered him a word.
Hosea 10:2
Their heart hath been divided, now they are guilty, He doth break down their altars, He doth destroy their standing-pillars.
Zephaniah 1:5
And those bowing themselves On the roofs to the host of the heavens, And those bowing themselves, Swearing to Jehovah, and swearing by Malcham,
Matthew 6:24
'None is able to serve two lords, for either he will hate the one and love the other, or he will hold to the one, and despise the other; ye are not able to serve God and Mammon.
Luke 16:13
'No domestic is able to serve two lords, for either the one he will hate, and the other he will love; or one he will hold to, and of the other he will be heedless; ye are not able to serve God and mammon.'

General references

Exodus 20:23
ye do not make with Me gods of silver, even gods of gold ye do not make to yourselves.
James 1:8
a two-souled man is unstable in all his ways.