Neh 8:10 Then he said unto them, Go your way, eat the fat, and drink the sweet, and send portions unto them for whom nothing is prepared: for this day is holy unto our Lord: neither be ye sorry; for the joy of the LORD is your strength.
Psa 21:1 <To the chief Musician, A Psalm of David.> The king shall joy in thy strength, O LORD; and in thy salvation how greatly shall he rejoice!
emphasis mine.