Ps 9:2, Ps 22:26, Ps 70:4, Ps 105:3, Ps 119:2, Phil 3:8, 1 Pt 1:8, Jn 16:22

In the Old Testament, David confessed that those who seek God will rejoice in God. (Psalms 40:16, Psalms 9:2, Psalms 22:26, Psalms 105:3, Psalms 119:2)

Psalms 40:16 Let all those that seek thee rejoice and be glad in thee: let such as love thy salvation say continually, The Lord be magnified.

Psalms 9:2 I will be glad and rejoice in thee: I will sing praise to thy name, O thou most High.

Psalms 22:26 The meek shall eat and be satisfied: they shall praise the Lord that seek him: your heart shall live for ever.

Psalms 105:3 Glory ye in his holy name: let the heart of them rejoice that seek the Lord.

Psalms 119:2 Blessed are they that keep his testimonies, and that seek him with the whole heart.

To know Christ Jesus is the noblest and most joyous thing. (Phil 3:8, 1 Pet 1:8)

Phil 3:8 Yea doubtless, and I count all things but loss for the excellency of the knowledge of Christ Jesus my Lord: for whom I have suffered the loss of all things, and do count them but dung, that I may win Christ,

1 Pet 1:8 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:

When we know that Jesus is the Christ who died and rose again according to the Bible, our hearts are filled with joy. (John 16:22)

John 16:22 And ye now therefore have sorrow: but I will see you again, and your heart shall rejoice, and your joy no man taketh from you.