28 without being frightened in any way by those who oppose you. This is a sign to them that they will be destroyed, but that you will be saved—and that by God.

Read Philippians 1:28 Using Other Translations

And in nothing terrified by your adversaries: which is to them an evident token of perdition, but to you of salvation, and that of God.
and not frightened in anything by your opponents. This is a clear sign to them of their destruction, but of your salvation, and that from God.
Don’t be intimidated in any way by your enemies. This will be a sign to them that they are going to be destroyed, but that you are going to be saved, even by God himself.