Strive not with a man without cause, if he have done thee no harm.
King James Version (public domain)
Traditionally attributed to Solomon · c. 10th century BC · King of Israel, renowned for wisdom
What does Proverbs 3:30 say in the KJV?
Context
28Say not unto thy neighbour, Go, and come again, and to morrow I will give; when thou hast it by thee.
29Devise not evil against thy neighbour, seeing he dwelleth securely by thee.
30Strive not with a man without cause, if he have done thee no harm.
31Envy thou not the oppressor, and choose none of his ways.
32For the froward is abomination to the LORD: but his secret is with the righteous.