He considered his own body to be already dead (since he was about 100 years old) and also considered the deadness of Sarah’s womb, without weakening in the faith.

For this is the statement of the promise: At this time I will come, and Sarah will have a son.

By faith even Sarah herself, when she was unable to have children, received power to conceive offspring, even though she was past the age, since she considered that the One who had promised was faithful.

just as Sarah obeyed Abraham, calling him lord. You have become her children when you do what is good and are not frightened by anything alarming.