John 3:33
Whoever does accept His testimony has certified with a seal that God is true.
John 6:27
Stop toiling for the food that perishes, but toil for the food that lasts for eternal life, which the Son of Man will give you, for God the Father has given Him authority to do so."
Romans 3:3-4
What then, if some of them have proved unfaithful? Can their unfaithfulness make null and void God's faithfulness?
Romans 4:18-21
Abraham, building on hope in spite of hopeless circumstances, had faith, and so he actually became the father of many nations, just as it had been told him, "So numberless shall your descendants be."
2 Corinthians 1:18
As certainly as God is to be trusted, my message to you has not been a "Yes" that might mean "No."
2 Corinthians 1:22
and put His seal upon us, and given us His Spirit in our hearts as a first installment of future rewards.
Ephesians 1:13
You too, as you have heard the message of the truth, the good news that means your salvation, and as you have trusted in Him too, have been stamped with the seal of the promised Holy Spirit,
Titus 1:1-2
Paul, a slave of God, and an apostle of Jesus Christ, to stimulate faith in God's chosen people and to lead them on to a full knowledge of religious truth,
Hebrews 6:17
Therefore, because God wanted to make the strongest demonstration of the unchangeable character of His purpose, He interposed with an oath,
1 John 5:9-10
If we accept the testimony of men, the testimony of God is stronger still; because this is the testimony that God has borne to His Son.
Revelation 7:3-8
"Do not injure the earth, the sea, or the trees, until we mark the slaves of our God with His seal on their foreheads."