Acts 13:47 cites a separate prophecy (Isaiah) about a light to the Gentiles, supporting that the prophets agree on Gentile inclusion.

Romans 15:8-12 compiles OT prophecies of Gentiles praising God, confirming the prophetic agreement James references.

Amos 9:11 is the specific prophecy James quotes in the next verse, providing the source of the prophetic word that agrees.

Galatians 3:8 cites the promise to Abraham that all nations would be blessed, another prophetic witness to Gentile inclusion.