Genesis 20:18

“For the Lord had fast closed up all the wombs of the house of Abimelech, because of Sarah Abraham’s wife. ”

KJV

Meaning

The narrator identifies the household's temporary infertility as part of the divine intervention surrounding Sarah's taking.

This verse must not be generalized into the claim that infertility today is evidence of personal guilt, divine punishment, or deficient faith.

Responsible interpretation keeps the narrator's explanation tied to this story rather than using it to burden people facing infertility.