Psalm100:1-5 Make a joyful noise unto the Lord, all the earth! 2 Serve the Lord with gladness; come before His presence with singing. 3 Know that the Lord, He is God; it is He who has made us, and not we ourselves; we are His people, and the sheep of His pasture.
4 Enter into His gates with thanksgiving, and into His courts with praise; be thankful to Him, and bless His name. 5 For the Lord is good; His mercy endures forever, and His faithfulness to all generations.
The command is for all of creation is when we come before the Lord our God, we are to joyfully come with praise and thanksgiving.
Why are we commanded to come to the Lord with praise and thanksgiving? (1) He alone is God, (2) It is He who made us, (3) We are His people and this is what H expects of us, (4) He is and has been good to ALL of us, (5) He is merciful and is from everlasting to everlasting, (5) He is faithful to us, and every one of our generations before us and after us. He is even faithful to our children and our children's generations.
People of God, give thanks unto the Lord your God!