Has He said, and will He not do it?

He did not waver at the promise of God through unbelief, but was strengthened in faith, giving glory to God, and being fully convinced that what He had promised He was also able to perform. Rom. 4:20-21

Oh LORD, may I also stand fast on your promises, being strengthened in faith, and giving all the glory to You! I know that You are completely able to do what You said you would do, and that You WILL fulfill Your promises.

Fear not, for I am with you. Be undismayed, for I am your God. I will help you, yes, I will strengthen you. I will uphold you with My righteous right hand.
Is. 41:10

God is not a man that He should lie, nor the son of man that He should repent. Has He said, and will He not do it? Or has He spoken, and will He not make it good?
Num. 23:19