As Christians we should suspect to face opposition because God has promised it. When we are living for Christ, and speaking openly concerning the ways of God we are bound to encounter opposition.
2 Timothy 3:12The Lexham English Bible
And indeed, all those who want to live in a godly manner in Christ Jesus will be persecuted.
- Although I would not use the word "promised" ("God has promised opposition") in the way that God talked about opposition to Him and His appointed servants, but rather the word "predicted" or "prophesied" ("God predicted that His servants will face opposition and persecution from the world").