Revelation 3:15

I know thy works, that thou art neither cold nor hot; I would thou wert cold or hot.

Matthew 24:12

and because lawlessness shall prevail, the love of the most shall grow cold;

Romans 12:11

as to diligent zealousness, not slothful; in spirit fervent; serving the Lord.

Revelation 3:1

And to the angel of the assembly in Sardis write: These things saith he that has the seven Spirits of God, and the seven stars: I know thy works, that thou hast a name that thou livest, and art dead.

Deuteronomy 5:29

Oh that there were such a heart in them, that they would fear me, and keep all my commandments continually, that it might be well with them and with their sons for ever!

Joshua 24:15-24

And if it seem evil unto you to serve Jehovah, choose you this day whom ye will serve; whether the gods whom your fathers that were on the other side of the river served, or the gods of the Amorite, in whose land ye dwell; but as for me and my house, we will serve Jehovah.

1 Kings 18:21

Then Elijah drew near to all the people, and said, How long do ye halt between two opinions? if Jehovah be God, follow him; and if Baal, follow him. And the people answered him not a word.

Psalm 81:11-13

But my people hearkened not to my voice, and Israel would none of me.

Proverbs 23:26

My son, give me thy heart, and let thine eyes observe my ways.

Hosea 7:8

Ephraim, he mixeth himself with the peoples; Ephraim is a cake not turned.

Hosea 10:2

Their heart is divided; now shall they be found guilty: he will break down their altars, he will destroy their statues.

Zephaniah 1:5-6

and them that bow down to the host of the heavens upon the housetops; and them that bow down to Jehovah, that swear by him, and swear by Malcham;

Matthew 6:24

No one can serve two masters; for either he will hate the one and will love the other, or he will hold to the one and despise the other. Ye cannot serve God and mammon.

Matthew 10:37

He who loves father or mother above me is not worthy of me; and he who loves son or daughter above me is not worthy of me.

Luke 14:27-28

and whoever does not carry his cross and come after me cannot be my disciple.

1 Corinthians 16:22

If any one love not the Lord Jesus Christ let him be Anathema Maranatha.

2 Corinthians 12:20

For I fear lest perhaps coming I find you not such as I wish, and that I be found by you such as ye do not wish: lest there might be strifes, jealousies, angers, contentions, evil speakings, whisperings, puffings up, disturbances;

Philippians 1:9

And this I pray, that your love may abound yet more and more in full knowledge and all intelligence,

2 Thessalonians 1:3

We ought to thank God always for you, brethren, even as it is meet, because your faith increases exceedingly, and the love of each one of you all towards one another abounds;

James 1:8

he is a double-minded man, unstable in all his ways.

1 Peter 1:22

Having purified your souls by obedience to the truth to unfeigned brotherly love, love one another out of a pure heart fervently;

Revelation 2:2

I know thy works and thy labour, and thine endurance, and that thou canst not bear evil men; and thou hast tried them who say that themselves are apostles and are not, and hast found them liars;

Revelation 2:4

but I have against thee, that thou hast left thy first love.

Treasury of Scripture Knowledge

Bible References

That

Revelation 2:4
but I have against thee, that thou hast left thy first love.
Matthew 24:12
and because lawlessness shall prevail, the love of the most shall grow cold;
Philippians 1:9
And this I pray, that your love may abound yet more and more in full knowledge and all intelligence,
2 Thessalonians 1:3
We ought to thank God always for you, brethren, even as it is meet, because your faith increases exceedingly, and the love of each one of you all towards one another abounds;
1 Peter 1:22
Having purified your souls by obedience to the truth to unfeigned brotherly love, love one another out of a pure heart fervently;

I would

Deuteronomy 5:29
Oh that there were such a heart in them, that they would fear me, and keep all my commandments continually, that it might be well with them and with their sons for ever!
Psalm 81:11
But my people hearkened not to my voice, and Israel would none of me.
2 Corinthians 12:20
For I fear lest perhaps coming I find you not such as I wish, and that I be found by you such as ye do not wish: lest there might be strifes, jealousies, angers, contentions, evil speakings, whisperings, puffings up, disturbances;

Thou

Joshua 24:15
And if it seem evil unto you to serve Jehovah, choose you this day whom ye will serve; whether the gods whom your fathers that were on the other side of the river served, or the gods of the Amorite, in whose land ye dwell; but as for me and my house, we will serve Jehovah.
1 Kings 18:21
Then Elijah drew near to all the people, and said, How long do ye halt between two opinions? if Jehovah be God, follow him; and if Baal, follow him. And the people answered him not a word.
Proverbs 23:26
My son, give me thy heart, and let thine eyes observe my ways.
Hosea 7:8
Ephraim, he mixeth himself with the peoples; Ephraim is a cake not turned.
Hosea 10:2
Their heart is divided; now shall they be found guilty: he will break down their altars, he will destroy their statues.
Zephaniah 1:5
and them that bow down to the host of the heavens upon the housetops; and them that bow down to Jehovah, that swear by him, and swear by Malcham;
Matthew 6:24
No one can serve two masters; for either he will hate the one and will love the other, or he will hold to the one and despise the other. Ye cannot serve God and mammon.
Matthew 10:37
He who loves father or mother above me is not worthy of me; and he who loves son or daughter above me is not worthy of me.
Luke 14:27
and whoever does not carry his cross and come after me cannot be my disciple.
1 Corinthians 16:22
If any one love not the Lord Jesus Christ let him be Anathema Maranatha.
James 1:8
he is a double-minded man, unstable in all his ways.

General references

Luke 11:23
He that is not with me is against me, and he that gathers not with me scatters.