1 Corinthians 8:12

Thus, sinning against your brethren and wounding their conscience when it is weak, you sin against Christ.

1 John 3:15

Anyone who 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
Thus, sinning against your brethren and wounding their conscience when it is weak, you sin against Christ.
1 John 3:15
Anyone who hates his brother is a murderer, and you know that no murderer has eternal life abiding in him.