Jeremiah 29:11 (NIV) “For I know the plans I have for you,” declares the Lord, “plans to prosper you and not to harm you, plans to give you hope and a future.” 

1 Samuel 30:6b (KJV) David encouraged himself in the Lord. 

Philippians 4:4 (ESV) Rejoice in the Lord always; again I will say, rejoice. 

Psalm 34:1-4 (ESV) I will bless the Lord at all times; his praise shall continually be in my mouth. 2 My soul makes its boast in the Lord; let the humble hear and be glad. 3 Oh, magnify the Lord with me, and let us exalt his name together! 4 I sought the Lord, and he answered me and delivered me from all my fears. 

Acts 16:25 (ESV) About midnight Paul and Silas were praying and singing hymns to God … 

Acts 16:25-26 (ESV) About midnight Paul and Silas were praying and singing hymns to God, and the prisoners were listening to them, 26 and suddenly there was a great earthquake, so that the foundations of the prison were shaken. And immediately all the doors were opened, and everyone’s bonds were unfastened. 

2 Chronicles 20:21-22 (ESV) he appointed those who were to sing to the Lord and praise him in holy attire, as they went before the army, and say, “Give thanks to the Lord, for his steadfast love endures forever.” 22 And when they began to sing and praise, the Lord set an ambush against the men … who had come against Judah, so that they were routed. 

Nehemiah 8:10 (ESV) the joy of the Lord is your strength