Revelation 3:4-9

4But thou hast a few names in Sardis which have not defiled their garments, and they shall walk with me in white, because they are worthy.

5He that overcomes, he shall be clothed in white garments, and I will not blot his name out of the book of life, and will confess his name before my Father and before his angels.

6He that has an ear, let him hear what the Spirit says to the assemblies.

7And to the angel of the assembly in Philadelphia write: These things saith the holy, the true; he that has the key of David, he who opens and no one shall shut, and shuts and no one shall open:

8I know thy works: behold, I have set before thee an opened door, which no one can shut, because thou hast a little power, and hast kept my word, and hast not denied my name.

9Behold, I make them of the synagogue of Satan who say that they are Jews, and are not, but lie; behold, I will cause that they shall come and shall do homage before thy feet, and shall know that I have loved thee.