OUR FATHER WHO IS WORTHY OF HONOR AND PRAISE
99 100 verse 12 3 says this;
Know that the LORD is God. It is he who made us, and we are his ; we are his people, the sheep of his pasture.
This verse, as part of exhorting the people of God to joyously worship our God, reminds us who the Lord is. He is truly God and is the one who made us and we are voluntarily in His custody. We belong to Him and we are a flock of sheep under His care.
He is worthy of our worship because, as verse 5 says;
For the LORD is good and his love endures forever; his faithfulness continues through all generations.