What does Nehemiah 8:10 mean?

Nehemiah told them, 'Go celebrate with good food and sweet drinks, and share with anyone who doesn't have enough. This day is holy to our Lord. Don't be sad—the joy you find in God is your strength.' Nehemiah 8:10 - Modern Text Bible

(Nehemiah encourages celebration and generosity, teaching that joy in God is what sustains and empowers them.)