Roma 4:4

4:4 Now to the one who works, his pay is not credited due to grace but due to obligation. ¹ 

Roma 4:10

4:10 How then was it credited to him? Was he circumcised at the time, or not? No, he was not circumcised but uncircumcised!

Roma 9:7

9:7 nor are all the children Abraham’s true descendants; rather “through Isaac will your descendants be counted.” ² 

[4:4]  ¹ tn Grk “not according to grace but according to obligation.”

[9:7]  ² tn Grk “be called.” The emphasis here is upon God’s divine sovereignty in choosing Isaac as the child through whom Abraham’s lineage would be counted as opposed to Ishmael.

[9:7]  sn A quotation from Gen 21:12.