Matthew 24:35

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

Hebrews 6:18-20

that by two immutable things, in which it is impossible for God to fail, we might have strong consolation, who have fled for refuge to lay hold on 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 shall pass away, but my words shall not pass away.
Hebrews 6:18
that by two immutable things, in which it is impossible for God to fail, we might have strong consolation, who have fled for refuge to lay hold on the hope set before us;