We sing and play musical instruments because Psalm 100 says to “Shout for joy to the Lord, all the earth. Worship the Lord with gladness; come before him with joyful songs.”
We raise our hands in praise because Psalm 134 says to “Lift up your hands in the sanctuary and praise the Lord.”
We give testimonies aloud to the church “for the edifying of the body of Christ…” as Paul instructs in Ephesians.
We pray aloud because the New Testament church raised their voices together in prayer to God.” (Acts 4:24)
We clap our hands in praise because Psalm 47 says to “clap your hands, all you nations; shout to God with cries of joy.”