'Joy' in the Bible

For seven days you are to celebrate in the presence of the LORD your God at the place where the LORD will choose; for the LORD your God will bless you in all your harvest and in everything you do, and your joy will be complete.

"Sing for joy, nations! Sing for joy, people who belong to him! For he'll avenge the blood of his servants, turn on his adversary, and cleanse both his land and his people."