Revelation 7:2-3

2 And I saw another angel ascending from the east, having the seal of the living God: and he cried with a loud voice to the four angels, to whom it was given to hurt the earth and the sea, 3 Saying, Hurt not the earth, neither the sea, nor the trees, till we have sealed the servants of our God in their foreheads.

2 Corinthians 1:21-22

21 Now he which stablisheth us with you in Christ, and hath anointed us, is God; 22 Who hath also sealed us, and given the earnest of the Spirit in our hearts.

Ephesians 1:12-14 and 4:30

12 That we should be to the praise of his glory, who first trusted in Christ. 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, 14 Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.....

4:30 And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.

Nehemiah 9:38 - 10:2

38 And because of all this we make a sure covenant, and write it; and our princes, Levites, and priests, seal {Heb. are at the sealing, or, sealed} unto it. 10:1 Now those that sealed {Heb. at the sealings} were, Nehemiah, the Tirshatha {Heb. the Tirshatha: or, the governor} the son of Hachaliah, and Zidkijah, 2 Seraiah, Azariah, Jeremiah,.......

John 6:27

27 "Do not labor for the food which perishes, but for the food which endures to everlasting life, which the Son of Man will give you, because God the Father has set His seal on Him."