1 Corinthians 8:12

And in this way, when you sin against the brothers by injuring their weak conscience, you are [actually] sinning against Christ.

1 John 3:15

Every person who hates his brother is a murderer [in God's sight]; and you [surely] know that no murderer has [the hope of] never ending life remaining in his heart.

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
And in this way, when you sin against the brothers by injuring their weak conscience, you are [actually] sinning against Christ.
1 John 3:15
Every person who hates his brother is a murderer [in God's sight]; and you [surely] know that no murderer has [the hope of] never ending life remaining in his heart.