Hebrews 11:18

[even though] he had been told [by God, Gen. 21:12], "Your descendants will be traced through Isaac."

Romans 9:7

Neither are all [Jewish] people children [of God], [simply] because they are Abraham's descendants. But [Gen. 21:12 says], "It is through Isaac that you [i.e., Abraham] will have descendants."

Treasury of Scripture Knowledge did not add