Cross reference
Philippians 2:18
18 In the same way, you also rejoice, and rejoice with me.
James 1:2-4
2 Count it all joy, my brothers{The word for "brothers" here and where context allows may also be correctly translated "brothers and sisters" or "siblings."}, when you fall into various temptations,
3 knowing that the testing of your faith produces endurance.
4 Let endurance have its perfect work, that you may be perfect and complete, lacking in nothing.
Philippians 3:1
1 Finally, my brothers, rejoice in the Lord. To write the same things to you, to me indeed is not tiresome, but for you it is safe.
Philippians 4:4
4 Rejoice in the Lord always! Again I will say, Rejoice!
Ephesians 3:13
13 Therefore I ask that you may not lose heart at my troubles for you, which are your glory.