With a freewill offering I will sacrifice to you; I will give thanks to your name, O Lord, for it is good.Psalm 54:66. Because thanksgiving magnifies God.
I will praise the name of God with a song; I will magnify him with thanksgiving.Psalm 69:307. Because God is near to us.
We give thanks to you, O God; we give thanks, for your name is near. We recount your wondrous deeds.Psalm 75:18. Because God will ultimately deliver His people from their enemies.
But we your people, the sheep of your pasture, will give thanks to your forever; from generation to generation we will recount your praise. Psalm 79:139. Because it is a good thing to do.
It is good to give thanks to the Lord, to sing praises to your name, O Most High.Psalm 92:1