John 3:33
The person who has accepted Jesus' testimony has confirmed this [fact], that God is truthful.
John 6:27
Do not work for the [kind of] food that spoils, but for the kind that lasts until never ending life. The Son of man will give you this [kind of food], for God the Father has placed His seal [of approval] on Him."
2 Corinthians 1:22
He has placed His seal of ownership upon us by giving us the down payment of the Holy Spirit [to live] in our hearts.
Ephesians 1:13
You [Gentiles] also, who are in Christ, after having heard the message of truth, the good news about your salvation, and [after] believing in Him, were sealed [i.e., as evidence of ownership] with the promised Holy Spirit. [or, "the Holy Spirit who brings promises"].
Ephesians 4:30
And do not grieve God's Holy Spirit by whom you were sealed [i.e., given evidence of God's ownership] until the day of redemption [i.e., until you receive your new body in heaven. See 1:14].
Revelation 7:2
And I saw another angel coming up from the east; he held the seal of the living God. [Note: This "seal" was a mark of identification or ownership]. And he called out with a loud voice to the four angels who had been given [the power] to harm the land and the ocean,
Revelation 9:4
And they were told not to harm the grass on earth, or any greenery, or any tree, but only those people who did not have God's seal on their foreheads.