Paul refers back to Abraham as a symbol of faith and uses Sarah and Hagar to represent two ways of pursuing God’s promise; one by works, and the other by faith. Only one is the true son of Abraham.
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The New Testament in Its World: An Introduction to the History, Literature, and Theology of the First Christians
N.T. Wright
Archeological Study Bible
Walter C Kaiser et. al
Handbook on the Pentateuch
Victor P Hamilton
Galatians
N.T. Wright
