Verses with the word sure in the New Testament (14 verses):

Matthew 27:64
Command therefore that the sepulchre be made sure until the third day, lest his disciples come by night, and steal him away, and say unto the people, He is risen from the dead: so the last error shall be worse than the first.

Matthew 27:65
Pilate said unto them, Ye have a watch: go your way, make it as sure as ye can.

Matthew 27:66
So they went, and made the sepulchre sure, sealing the stone, and setting a watch.

Luke 10:11
Even the very dust of your city, which cleaveth on us, we do wipe off against you: notwithstanding be ye sure of this, that the kingdom of God is come nigh unto you.

John 6:69
And we believe and are sure that thou art that Christ, the Son of the living God.

John 16:30
Now are we sure that thou knowest all things, and needest not that any man should ask thee: by this we believe that thou camest forth from God.

Acts 13:34
And as concerning that he raised him up from the dead, now no more to return to corruption, he said on this wise, I will give you the sure mercies of David.

Romans 2:2
But we are sure that the judgment of God is according to truth against them which commit such things.

Romans 4:16
Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,

Romans 15:29
And I am sure that, when I come unto you, I shall come in the fulness of the blessing of the gospel of Christ.

2 Timothy 2:19
Nevertheless the foundation of God standeth sure, having this seal, The Lord knoweth them that are his. And, Let every one that nameth the name of Christ depart from iniquity.

Hebrews 6:19
Which hope we have as an anchor of the soul, both sure and stedfast, and which entereth into that within the veil;

2 Peter 1:10
Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall:

2 Peter 1:19
We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: