Proverbs 23:11 KJV

For their redeemer is mighty; he shall plead their cause with thee.
Proverbs 23:11, King James Version

In context

10 Remove not the old landmark; and enter not into the fields of the fatherless:

11 For their redeemer is mighty; he shall plead their cause with thee.

12 Apply thine heart unto instruction, and thine ears to the words of knowledge.