John 3:33
He who so takes his witness has made clear his faith that God is true.
John 6:27
Let your work not be for the food which comes to an end, but for the food which goes on for eternal life, which the Son of man will give to you, for on him has God the Father put his mark.
Romans 3:3-4
And if some have no faith, will that make the faith of God without effect?
Romans 4:18-21
Who without reason for hope, in faith went on hoping, so that he became the father of a number of nations, as it had been said, So will your seed be.
2 Corinthians 1:18
As God is true, our word to you is not Yes and No.
2 Corinthians 1:22
And it is he who has put his stamp on us, even the Spirit, as the sign in our hearts of the coming glory.
Ephesians 1:13
In whom you, having been given the true word, the good news of your salvation, and through your faith in him, were given the sign of the Holy Spirit of hope,
Titus 1:1-2
Paul, a servant of God, and an Apostle of Jesus Christ, in agreement with the faith of the saints of God and the full knowledge of what is true in harmony with religion,
Hebrews 6:17
So that when it was God's desire to make it specially clear to those who by his word were to have the heritage, that his purpose was fixed, he made it more certain with an oath;
1 John 5:9-10
If we take the witness of men to be true, the witness of God is greater: because this is the witness which God has given about his Son.
Revelation 7:3-8
Do no damage to the earth, or the sea, or the trees, till we have put a mark on the servants of our God.