Psalms 100:4
Enter into his gates with thanksgiving, and into his courts with praise: be thankful unto him, and bless his name.
Romans 1:21
Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
Colossians 3:15
And let the peace of God rule in your hearts, to the which also ye are called in one body; and be ye thankful.