Many versions interpret this verse as referring to Sarah, and others interpret it as referring to Abraham.
# It was by faith, even though Sarah herself was barren, that Abraham received ability to father a child. This happened even though he was too old, since he considered
Some versions interpret this verse as referring to Sarah. "By faith Sarah, herself also barren, received power to bear children even beyond the time of maturity, since she considered"
The abstract noun "faith" can be expressed with the verb "believe." Possible meanings are 1) it was by Abraham's faith. Alternate translation: "It was because Abraham believed God" or 2) it was by Sarah's faith. Alternate translation: "It was because Sarah believed God" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])