Matthew 24:35

Earth and sky will pass away but my words will never pass away.

Hebrews 6:18-20

so that by these two unalterable things, which make it impossible for God to break his promise, we who have taken refuge with him may be greatly encouraged to seize upon the hope that is offered to 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 my words will never pass away.
Hebrews 6:18
so that by these two unalterable things, which make it impossible for God to break his promise, we who have taken refuge with him may be greatly encouraged to seize upon the hope that is offered to us.