Micah 7:5
Put no faith in a friend, do not let your hope be placed in a relation: keep watch on the doors of your mouth against her who is resting on your breast.
Jeremiah 9:4
Let everyone keep watch on his neighbour, and put no faith in any brother: for every brother will certainly be tricking his brother, and every neighbour will go about saying evil.
Judges 16:5-20
And the chiefs of the Philistines came up to her, and said to her, Make use of your power over him and see what is the secret of his great strength, and how we may get the better of him, and put bands on him, so that we may make him feeble; and every one of us will give you eleven hundred shekels of silver.
Job 6:14-15
He whose heart is shut against his friend has given up the fear of the Ruler of all.
Psalm 118:8-9
It is better to have faith in the Lord than to put one's hope in man.
Matthew 10:16
See, I send you out as sheep among wolves. Be then as wise as snakes, and as gentle as doves.