John 3:33

He who has received His testimony has set his seal to this, that God is true.

John 6:27

Do not work for the food which perishes, but for the food which endures to eternal life, which the Son of Man will give to you, for on Him the Father, God, has set His seal.”

Romans 3:3-4

What then? If some did not believe, their unbelief will not nullify the faithfulness of God, will it?

Romans 4:18-21

In hope against hope he believed, so that he might become a father of many nations according to that which had been spoken, “So shall your descendants be.”

2 Corinthians 1:18

But as God is faithful, our word to you is not yes and no.

2 Corinthians 1:22

who also sealed us and gave us the Spirit in our hearts as a pledge.

Ephesians 1:13

In Him, you also, after listening to the message of truth, the gospel of your salvation—having also believed, you were sealed in Him with the Holy Spirit of promise,

Titus 1:1-2

Paul, a bond-servant of God and an apostle of Jesus Christ, for the faith of those chosen of God and the knowledge of the truth which is according to godliness,

Hebrews 6:17

In the same way God, desiring even more to show to the heirs of the promise the unchangeableness of His purpose, interposed with an oath,

1 John 5:9-10

If we receive the testimony of men, the testimony of God is greater; for the testimony of God is this, that He has testified concerning His Son.

Revelation 7:3-8

saying, “Do not harm the earth or the sea or the trees until we have sealed the bond-servants of our God on their foreheads.”

Treasury of Scripture Knowledge

Summary

He that hath received his testimony hath set to his seal that God is true.

Bible References

Hath set

Romans 3:3
What then? If some did not believe, their unbelief will not nullify the faithfulness of God, will it?
Romans 4:18
In hope against hope he believed, so that he might become a father of many nations according to that which had been spoken, “So shall your descendants be.”
2 Corinthians 1:18
But as God is faithful, our word to you is not yes and no.
Titus 1:1
Paul, a bond-servant of God and an apostle of Jesus Christ, for the faith of those chosen of God and the knowledge of the truth which is according to godliness,
Hebrews 6:17
In the same way God, desiring even more to show to the heirs of the promise the unchangeableness of His purpose, interposed with an oath,
1 John 5:9
If we receive the testimony of men, the testimony of God is greater; for the testimony of God is this, that He has testified concerning His Son.