genesis 27:30 And it came to pass, as soon as Isaac had made an end of blessing Jacob, and Jacob was yet scarce gone out from the presence of Isaac his father, that Esau his brother came in from his hunting. - Free Bible Online

      30-35. Esau came in from his hunting--Scarcely had the former scene been concluded, when the fraud was discovered. The emotions of Isaac, as well as Esau, may easily be imagined--the astonishment, alarm, and sorrow of the one; the disappointment and indignation of the other. But a moment's reflection convinced the aged patriarch that the transfer of the blessing was "of the Lord," and now irrevocable. The importunities of Esau, however, overpowered him; and as the prophetic afflatus was upon the patriarch, he added what was probably as pleasing to a man of Esau's character as the other would have been.

JFB.