'Bond servants' in the Bible

This is the revelation of Jesus Christ [His unveiling of the divine mysteries], which God [the Father] gave to Him to show to His bond-servants (believers) the things which must soon take place [in their entirety]; and He sent and communicated it by His angel (divine messenger) to His bond-servant John,

saying, “Do not harm the earth nor the sea nor the trees until we seal (mark) the bond-servants of our God on their foreheads.”