Matthew 24:35

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

Romans 11:29

for the divine gifts and vocation are irrevocable.

James 1:17

every thing that is valuable, every gift that leads to perfection is deriv'd from heaven, it descends from that original light, which knows no change, no shadow, or decline:

Treasury of Scripture Knowledge

Summary

My covenant will I not break, nor alter the thing that is gone out of my lips.

Bible References

Nor

Matthew 24:35
heaven and earth may fail, but my words shall never fail.
Romans 11:29
for the divine gifts and vocation are irrevocable.
James 1:17
every thing that is valuable, every gift that leads to perfection is deriv'd from heaven, it descends from that original light, which knows no change, no shadow, or decline: