Psalm 78:37

For their heart was not steadfast with him, nor were they faithful to his covenant.

Psalm 78:8

and not be like their ancestors, a stubborn and rebellious generation, a generation [that] did not make ready its heart, whose spirit was not faithful [to] God.

Acts 8:21

{You have no} part or share in this matter, because your heart is not right before God.

Deuteronomy 31:20

For when I bring them into the land that I swore to their ancestors, a land flowing with milk and honey, {they will eat their fill}, and they will become fat, and [then] they will turn to other gods, and they will serve them, and they will spurn me, and they will break my covenant.

Psalm 44:17-18

All this has befallen us, though we have not forgotten you, and we have not been false to your covenant.

Psalm 51:10

Create a clean heart for me, O God, and renew a steadfast spirit {within me}.

Psalm 119:80

May my heart be blameless in your statutes, so that I may not be ashamed.

Hosea 7:14

They do not cry out to me from their heart, but they wail on their beds; because of grain and new wine they lacerate themselves; they depart from me.

Hosea 7:16-1

They turn, not to the Most High, like a slack bow; their officials will fall by the sword because of the anger of their tongue. This [is] their scorn in the land of Egypt.

Hosea 10:2

Their heart is false; now they must bear [their] guilt. He himself will break down their altars; he will destroy their stone pillars.

Treasury of Scripture Knowledge

Summary

For their heart was not right with him, neither were they stedfast in his covenant.

General references

Bible References

Their heart

Psalm 119:80
May my heart be blameless in your statutes, so that I may not be ashamed.
Hosea 7:14
They do not cry out to me from their heart, but they wail on their beds; because of grain and new wine they lacerate themselves; they depart from me.
Hosea 10:2
Their heart is false; now they must bear [their] guilt. He himself will break down their altars; he will destroy their stone pillars.
Acts 8:21
{You have no} part or share in this matter, because your heart is not right before God.

Stedfast

Psalm 78:8
and not be like their ancestors, a stubborn and rebellious generation, a generation [that] did not make ready its heart, whose spirit was not faithful [to] God.
Psalm 44:17
All this has befallen us, though we have not forgotten you, and we have not been false to your covenant.
Deuteronomy 31:20
For when I bring them into the land that I swore to their ancestors, a land flowing with milk and honey, {they will eat their fill}, and they will become fat, and [then] they will turn to other gods, and they will serve them, and they will spurn me, and they will break my covenant.
Hosea 8:1
[Put] to your lips [the] trumpet like a vulture over the house of Yahweh, because they have {broken my covenant} and rebelled against my law.

General references

Hosea 8:2
They cry out to me, "My God! We, Israel, know you!"