What does the Bible say truth is...

John 17:17 "Sanctify them by Your truth. Your word is truth."
Psalm 119:142 "Your righteousness is an everlasting righteousness, And Your law is truth."
Psalm 119:151 "You are near, O Lord, And all Your commandments are truth."
Psalm 119:160 "The entirety of Your word is truth, And every one of Your righteous judgments endures forever."

Thank you Father for revealing the Truth!