You put a new song in my mouth lyrics

I think you're referring to the classic song "You Put a New Song in My Heart"!

Here are the lyrics:

"You put a new song in my mouth A hymn of praise to our God My lips will shout for joy When I sing to you You put a new song in my mouth A hymn of praise to our God My lips will shout for joy When I sing to you"

This song is actually Psalm 40:3 in the Bible, set to music. It's a beautiful expression of praise and gratitude to God for giving us a new song to sing, a new heart to sing it with, and a new life to live for Him.