Commentaries:
Barnes' Notes
Serve the Lord with gladness - That is, In your worship, and in all your acts of obedience. Let there be joy in this service. Let it not be with the fear of slaves; not as a matter of compulsion and force; not with reluctance, moroseness, or gloom. Let it be a cheerful, happy service; let it be freely rendered, let it be an occasion of joy to the soul. The service of God is a source of the highest joy that man knows.
Come before his presence with singing - As expressive of joy. So the birds sing; so nature rejoices; so should man - intelligent, redeemed, immortal man, be joyful.
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