Matthew 24:35

heaven and earth may fail, but my words shall never fail.

Hebrews 6:18-20

that by two immutable things in which it was impossible for God to deceive us, we, who have no other refuge to fly to, but to maintain our present hopes,

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 may fail, but my words shall never fail.
Hebrews 6:18
that by two immutable things in which it was impossible for God to deceive us, we, who have no other refuge to fly to, but to maintain our present hopes,