It looks like you're looking for the lyrics to a song titled or containing the phrase "Oh How Good It Is." There are a few songs with similar titles, but one well-known worship song with that phrase is "Oh How Good It Is" by Keith & Kristyn Getty. Here are the opening lyrics to that song:

"Oh How Good It Is" – Keith & Kristyn Getty

Oh, how good it is
When God’s people live together in unity!
Oh, how good it is
When God’s people live together in unity! If this is not the song you meant, could you please provide more details? For example, the artist name or a few more lyrics, so I can help you find the exact song.