Ephesians 1:13
in Whom ye also??fter having heard the word of the truth, the Gospel of your salvation, in Whom having also believed??ere sealed with the Holy Spirit of promise,
Ephesians 4:30
And grieve not the Holy Spirit of God, in Whom ye were sealed unto the day of redemption.
2 Timothy 2:19
Nevertheless, the firm foundation of God has been standing, having this seal, "The Lord knew those who are His:" and "Let every one who names the name of the Lord depart from unrighteousness."
Revelation 7:2
And I saw another angel ascending from the rising of the sun, having a seal of the living God; and he cried with a great voice to the four angels, to whom it was given to hurt the earth and the sea,