Here are 6 Bible verses about feedback from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Proverbs 27:6 KJV
Faithful are the wounds of a friend; but the kisses of an enemy are deceitful.
Proverbs 1:5 KJV
A wise man will hear, and will increase learning; and a man of understanding shall attain unto wise counsels:
Luke 9:10 KJV
And the apostles, when they were returned, told him all that they had done. And he took them, and went aside privately into a desert place belonging to the city called Bethsaida.
Matthew 5:18 KJV
For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
Proverbs 18:2 KJV
A fool hath no delight in understanding, but that his heart may discover itself.
Proverbs 12:15 KJV
The way of a fool is right in his own eyes: but he that hearkeneth unto counsel is wise.