1 Corinthians 8:12

But if you sin in this way against the brethren, and wound their weak conscience, you sin against Christ.

1 John 3:15

Whoever hates his brother, is a murderer: and you know that no murderer has eternal life abiding in him.

Treasury of Scripture Knowledge

Summary

And Jonathan spake good of David unto Saul his father, and said unto him, Let not the king sin against his servant, against David; because he hath not sinned against thee, and because his works have been to theeward very good:

Bible References

Sin against

1 Corinthians 8:12
But if you sin in this way against the brethren, and wound their weak conscience, you sin against Christ.
1 John 3:15
Whoever hates his brother, is a murderer: and you know that no murderer has eternal life abiding in him.