Revelation 3:6

4Thou hast a few names even in Sardis which have not defiled their garments; and they shall walk with me in white: for they are worthy.

5He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels.

6He that hath an ear, let him hear what the Spirit saith unto the churches.

7And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth;

8I know thy works: behold, I have set before thee an open door, and no man can shut it: for thou hast a little strength, and hast kept my word, and hast not denied my name.