Revelation 3:2-6

Be constantly alert, and strengthen the things that remain, which were about to die; for I have not found your deeds completed in the sight of My God.

So remember what you have received and heard; and keep it, and repent. Then if you are not alert, I will come like a thief, and you will not know at what hour I will come to you.

But you have a few people in Sardis who have not soiled their garments; and they will walk with Me in white, for they are worthy.

The one who overcomes will be clothed the same way, in white garments; and I will not erase his name from the book of life, and I will confess his name before My Father and before His angels.

The one who has an ear, let him hear what the Spirit says to the churches.’ Message to Philadelphia