Matthew 24:35

Earth and sky will pass away, but it is certain that my words will not pass away.

Hebrews 6:18-20

He added an oath, in order that, through two unchangeable things, in which it is impossible for Him to prove false, we may possess mighty encouragement--we who, for safety, have hastened to lay hold of the hope set before us.

Treasury of Scripture Knowledge

Summary

Thy mercy, O LORD, is in the heavens; and thy faithfulness reacheth unto the clouds.

Bible References

Faithfulness

Matthew 24:35
Earth and sky will pass away, but it is certain that my words will not pass away.
Hebrews 6:18
He added an oath, in order that, through two unchangeable things, in which it is impossible for Him to prove false, we may possess mighty encouragement--we who, for safety, have hastened to lay hold of the hope set before us.