Matthew 24:35

Heaven and earth will pass away, but my words will not pass away.

Hebrews 6:18-20

so that, by two unchangeable things in which it is impossible for God to lie, we who have taken refuge would have strong encouragement to take 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
Heaven and earth will pass away, but my words will not pass away.
Hebrews 6:18
so that, by two unchangeable things in which it is impossible for God to lie, we who have taken refuge would have strong encouragement to take hold of the hope set before us.