2 Timothy 2:13

If we lose our trust, he is still to be trusted, for he cannot be false to himself!'

Romans 3:3

What follows then? Some, no doubt, showed a want of faith; but will their want of faith make God break faith? Heaven forbid!

Titus 1:2

and is based on the hope of Immortal Life, which God, who never lies, promised before the ages began,

Matthew 24:35

The heavens and the earth will pass away, but my words shall never pass away.

Romans 9:6

Not that God's Word has failed. For it is not all who are descended from Israel who are true Israelites;

1 Corinthians 1:9

God will not fail you, and it is he who called you into communion with his Son, Jesus Christ, our Lord.

1 Thessalonians 5:24

He who calls you will not fail you; he will complete his work.

2 Thessalonians 3:3

But the Lord will not fail you; he will give you strength, and guard you from Evil.

Hebrews 6:18

For he intended us to find great encouragement in these two unchangeable things, which make it impossible for God to prove false--we, I mean, who fled for safety where we might lay hold on the hope set before us.

Treasury of Scripture Knowledge

Summary

If we believe not, yet he abideth faithful: he cannot deny himself.

Bible References

Yet

Matthew 24:35
The heavens and the earth will pass away, but my words shall never pass away.
Romans 3:3
What follows then? Some, no doubt, showed a want of faith; but will their want of faith make God break faith? Heaven forbid!
Romans 9:6
Not that God's Word has failed. For it is not all who are descended from Israel who are true Israelites;
1 Thessalonians 5:24
He who calls you will not fail you; he will complete his work.
2 Thessalonians 3:3
But the Lord will not fail you; he will give you strength, and guard you from Evil.

He cannot

Titus 1:2
and is based on the hope of Immortal Life, which God, who never lies, promised before the ages began,
Hebrews 6:18
For he intended us to find great encouragement in these two unchangeable things, which make it impossible for God to prove false--we, I mean, who fled for safety where we might lay hold on the hope set before us.