Revelation 2:4

'But I have against thee: That thy first love thou didst leave!

Matthew 24:12-13

and because of the abounding of the lawlessness, the love of the many shall become cold;

Jeremiah 2:2-5

'Go, and thou hast called in the ears of Jerusalem, saying, Thus said Jehovah: I have remembered for thee The kindness of thy youth, the love of thine espousals, Thy going after Me in a wilderness, in a land not sown.

Philippians 1:9

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

Philippians 3:13-16

brethren, I do not reckon myself to have laid hold; and one thing -- the things behind indeed forgetting, and to the things before stretching forth --

1 Thessalonians 4:9-10

And concerning the brotherly love, ye have no need of my writing to you, for ye yourselves are God-taught to love one another,

2 Thessalonians 1:3

We ought to give thanks to God always for you, brethren, as it is meet, because increase greatly doth your faith, and abound doth the love of each one of you all, to one another;

Hebrews 6:10-11

for God is not unrighteous to forget your work, and the labour of the love, that ye shewed to His name, having ministered to the saints and ministering;

Revelation 2:14

'But I have against thee a few things: That thou hast there those holding the teaching of Balaam, who did teach Balak to cast a stumbling-block before the sons of Israel, to eat idol-sacrifices, and to commit whoredom;

Revelation 2:20

'But I have against thee a few things: That thou dost suffer the woman Jezebel, who is calling herself a prophetess, to teach, and to lead astray, my servants to commit whoredom, and idol-sacrifices to eat;

Revelation 3:14-17

And to the messenger of the assembly of the Laodiceans write: These things saith the Amen, the witness -- the faithful and true -- the chief of the creation of God;

Treasury of Scripture Knowledge

Summary

Nevertheless I have somewhat against thee, because thou hast left thy first love.

General references

Bible References

I have

Revelation 2:14
'But I have against thee a few things: That thou hast there those holding the teaching of Balaam, who did teach Balak to cast a stumbling-block before the sons of Israel, to eat idol-sacrifices, and to commit whoredom;

General references

Matthew 25:7
'Then rose all those virgins, and trimmed their lamps,
Hebrews 13:1
Let brotherly love remain;