The reading is from St. Paul's Letter to the Romans 4:4-12

Brethren, to one who works, his wages are not reckoned as a gift but as his due. And to one who does not work but trusts him who justifies the ungodly, his faith is reckoned as righteousness. So also David pronounces a blessing upon the man to whom God reckons righteousness apart from works: "Blessed are those whose iniquities are forgiven, and whose sins are covered; blessed is the man against whom the Lord will not reckon his sin." Is this blessing pronounced only upon the circumcised, or also upon the uncircumcised? We say that faith was reckoned to Abraham as righteousness. How then was it reckoned to him? Was it before or after he had been circumcised? It was not after, but before he was circumcised. He received circumcision as a sign or seal of the righteousness which he had by faith while he was still uncircumcised. The purpose was to make him the father of all who believe without being circumcised and who thus have righteousness reckoned to them, and likewise the father of the circumcised who are not merely circumcised but also follow the example of the faith which our father Abraham had before he was circumcised.