Strong G4972 σφραγίζω sphragizō · to seal

Ephesians

1. Ephesians 1:13
   In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,
2. Ephesians 4:30
   And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.