... If ye keep my commandments,
ye shall abide in My love;
even as I have kept My Father's commandments
and abide in His love.
These things have I spoken unto you,
that My joy might remain in you,
and that your joy might be full.
This is my commandment,
That ye love one another, as I have loved you...

John 15

This is the day which the Lord hath made;
We will rejoice and be glad in it.

Psalm 118:24

Enter into His gates with thanksgiving,
and into His courts with praise:
be thankful unto Him and bless His name.

Psalm 100:4

...For if, when we were enemies,
we were reconciled to God by the death of His Son,
much more, being reconciled, we shall be saved by His life.
And not only so, but we also joy in God
through our Lord Jesus Christ,
by whom we have now received the atonement.

Romans 5:10 & 11

Break forth into joy, sing together...

Isaiah 52:9

I will be glad and rejoice in thee:
I will sing praise to thy name,
O thou most High.

Psalm 9:2

...And be not drunk with wine, wherein is excess;
but be filled with the Spirit;
Speaking to yourselves in psalms and hyms and spiritual songs, singing and making melody in your heart to the Lord;
Giving thanks always for all things unto God and the Father
in the name of our Lord Jesus Christ.

Ephesians 5:18-20

For the kingdom of God is not meat and drink;
but righteousness and peace, and joy in the Holy Ghost.

Romans 14:17

Blessed are ye, when men shall revile you, and persecute you, and shall say all manner of evil against you falsely, for my sake.
Rejoice, and be exceeding glad:
for great is your reward in heaven:
for so persecuted they the prophets which were before you
Matthew 5:11 & 12

...Jesus Christ; whom having not seen, ye love;
in whom, though now ye see Him not, yet believing,
ye rejoice with joy unspeakable and full of glory.

1 Peter 1:8

My brethren, count it all joy
when ye fall into divers temptations; knowing this,
that the trying of your faith worketh patience.

James 1:2 & 3

I will sing unto the Lord as long as I live: 
I will sing praise to my God while I have my being.
My meditation of Him shall be sweet: 
I will be glad in the Lord.

Psalm 104: 33 & 34