Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar?
Abraham our father justified by works - evidentially before men (note, James 2:18). In James 2:23 James, like Paul, recognizes that it was his faith that was counted to Abraham for righteousness in his justification before God.
When he had offered, х anenengkas (G399)] - 'when he offered;' i:e., brought as an offering.