2 Samuel 6:12 etc.
GLADNESS OF SERVICE
2 Samuel 6:12 - And
it was told king David, saying, The Lord hath blessed the house of Obed-edom, and all that pertaineth
unto him, because of the ark of God. So David went and brought up the ark of
God from the house of Obed-edom into the city of
Psalm 100:2 - Serve the Lord with gladness: come before his presence with singing.
Deuteronomy 28:47-48 - Because thou servedst not the Lord thy God with joyfulness, and with gladness of heart, for the abundance of all things;  Therefore shalt thou serve thine enemies which the Lord shall send against thee, in hunger, and in thirst, and in nakedness, and in want of all things: and he shall put a yoke of iron upon thy neck, until he have destroyed thee.
GLADNESS IN HIS SANCTUARY
1 Chronicles 16:27 - Glory and honour are in his presence; strength and gladness are in his place.
Psalm 122:1 - I was glad when they said unto me, Let us go into the house of the Lord.
GLADNESS IN SONG
2 Chronicles 29:30 - Moreover Hezekiah the king and the princes commanded the Levites to sing praise unto the Lord with the words of David, and of Asaph the seer. And they sang praises with gladness, and they bowed their heads and worshipped.
Psalm 9:2 - I will be glad and rejoice in thee: I will sing praise to thy name, O thou most High.
Psalm 67:4 - O let the nations be glad and sing for joy: for thou shalt judge the people righteously, and govern the nations upon earth. Selah.
GLADNESS IN SPIRIT
Psalm 4:7 - Thou hast put gladness in my heart, more than in the time that their corn and their wine increased.
Psalm 30:11 - Thou hast turned for me my mourning into dancing: thou hast put off my sackcloth, and girded me with gladness;