1 Corinthians 8:12

By sinning against the brotherhood in this way and wounding their weaker consciences, you are sinning against Christ.

1 John 3:15

Anyone who hates his brother is a murderer, and you know that no murderer has eternal life remaining within 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
By sinning against the brotherhood in this way and wounding their weaker consciences, you are sinning against Christ.
1 John 3:15
Anyone who hates his brother is a murderer, and you know that no murderer has eternal life remaining within him.