He did not doubt God’s promise in unbelief;¹ rather, he was strengthened by faith and gave glory to God and was fully convinced that what he had promised he was also able to do. That is why it was credited to him as righteousness.

But it was not for him alone that it was written that it was credited to him; it was also for us, to whom it will be credited, who believe in the one who raised Jesus our Lord from the dead, who was handed over for our transgressions and was raised for our justification.

excerpt from second reading, 10^th Sunday OT, Romans 4:20-25.

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¹Hearing Paul's claim about Abraham reminded me of the apparent internal struggle presented in Genesis 17. Abraham's actions never reveal doubt ... he's like a robot sometimes ... but his words can.

The NAB footnote explains 4:20a this way: any doubts Abraham might have had were resolved in commitment to God's promise. IOW, Genesis read in light of Hebrews' "Hall of Faith," as always. The New illuminates the Old. I think these semantic gymnastics are known in the exegetical trade as "harmonizing Scripture."