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Where does the Bible say “rejoice in the Lord always”?

It is in Philippians 4:4 · King James Version

“Rejoice in the Lord alway: and again I say, Rejoice.”
Read the chapter Philippians 4 →

See also

1 Thessalonians 5:16

Rejoice evermore.

Psalms 118:24

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