Abraham did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God, being fully persuaded that God had power to do what he had promised.

Abraham did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God, being fully persuaded that God had power to do what he had promised.

Rom 4:21

¹⁸ Against all hope, Abraham in hope believed and so became the father of many nations, just as it had been said to him, “So shall your offspring be.”^[d] 19 without weakening in his faith, he faced the fact that his body was as good as dead—since he was about a hundred years old—and that Sarah’s womb was also dead. ²⁰ Yet he did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God,21 being fully persuaded that God had power to do what he had promised.

Rom 11:23

²² Consider therefore the kindness and sternness of God: sternness to those who fell, but kindness to you, provided that you continue in his kindness. Otherwise, you also will be cut off. ²³ And if they do not persist in unbelief, they will be grafted in, for God is able to graft them in again.

Rom 14:4

⁴ Who are you to judge someone else’s servant? To their own master, servants stand or fall. And they will stand, for the Lord is able to make them stand.

Rom 15:14

Because of the grace God gave me ¹⁶ to be a minister of Christ Jesus to the Gentiles. He gave me the priestly duty of proclaiming the gospel of God, so that the Gentiles might become an offering acceptable to God, sanctified by the Holy Spirit.

2 Tim 1:12

¹² That is why I am suffering as I am. Yet this is no cause for shame, because I know whom I have believed, and am convinced that he is able to guard what I have entrusted to him until that day.

We learn the following from the above verses

1)     Abraham did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God, being fully persuaded that God had power to do what he had promised.

2)     If they (unbelievers) do not persist in unbelief, they will be grafted in, for God is able to graft them in again.

3)     Lord is able to make His servants stand

4)     Lord gave the priestly duty of proclaiming the gospel of God, so that the Gentiles might become an offering acceptable to God, sanctified by the Holy Spirit.