כִּֽי־עָצֹ֤ר עָצַר֙ יְהוָ֔ה בְּעַ֥ד כָּל־רֶ֖חֶם לְבֵ֣ית אֲבִימֶ֑לֶךְ עַל־דְּבַ֥ר שָׂרָ֖ה אֵ֥שֶׁת אַבְרָהָֽם׃ (ס)
For the LORD had fast closed up all the wombs of the house of Abimelech, because of Sarah Abraham’s wife.
Read kabbalistic (mystical) interpretation of Genesis 20:18: and classical mystical sources.