Genesis 21:2

21:2 So Sarah became pregnant ¹  and bore Abraham a son in his old age at the appointed time that God had told him.

Genesis 25:21

25:21 Isaac prayed to ²  the Lord on behalf of his wife because she was childless. The Lord answered his prayer, and his wife Rebekah became pregnant.

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¹ tn Or “she conceived.”

² tn The Hebrew verb עָתַר (’atar), translated “prayed [to]” here, appears in the story of God’s judgment on Egypt in which Moses asked the Lord to remove the plagues. The cognate word in Arabic means “to slaughter for sacrifice,” and the word is used in Zeph 3:10 to describe worshipers who bring offerings. Perhaps some ritual accompanied Isaac’s prayer here.