John 3:33

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

John 6:27

Labour not for the meat which perisheth, but for that meat which endureth unto everlasting life, which the Son of man shall give unto you: for him hath God the Father sealed.

Romans 3:3-4

For what if some did not believe? shall their unbelief make the faith of God without effect?

Romans 4:18-21

Who against hope believed in hope, that he might become the father of many nations; according to that which was spoken, So shall thy seed be.

2 Corinthians 1:18

But as God is true, our word toward you was not yea and nay.

2 Corinthians 1:22

Who hath also sealed us, and given the earnest of the Spirit in our hearts.

Ephesians 1:13

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,

Titus 1:1-2

Paul, a servant of God, and an apostle of Jesus Christ, according to the faith of God's elect, and the acknowledging of the truth which is after godliness;

Hebrews 6:17

Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:

1 John 5:9-10

If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son.

Revelation 7:3-8

Saying, Hurt not the earth, neither the sea, nor the trees, till we have sealed the servants of our God in 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
For what if some did not believe? shall their unbelief make the faith of God without effect?
Romans 4:18
Who against hope believed in hope, that he might become the father of many nations; according to that which was spoken, So shall thy seed be.
2 Corinthians 1:18
But as God is true, our word toward you was not yea and nay.
Titus 1:1
Paul, a servant of God, and an apostle of Jesus Christ, according to the faith of God's elect, and the acknowledging of the truth which is after godliness;
Hebrews 6:17
Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:
1 John 5:9
If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son.

King James Version Public Domain