'Surety' in the Bible

“Now learn this lesson from the fig tree: As soon as its young shoots become tender and it puts out its leaves, you know that summer is near;

so you, too, when you see all these things [taking place], know for certain that He is near, right at the door.

And when Peter was come to himself, he said, Now I know of a surety, that the Lord hath sent his angel, and hath delivered me out of the hand of Herod, and from all the expectation of the people of the Jews.

For this ye know of a surety, that no fornicator, nor unclean person, nor covetous man, who is an idolater, hath any inheritance in the kingdom of Christ and God.

for when they may say, Peace and surety, then sudden destruction doth stand by them, as the travail doth her who is with child, and they shall not escape;

By so much was Jesus made a surety of a better testament.