Rabbi Johanan taught that when Jacob explained his rapid success in obtaining the meat by saying in that it was "because the Lord your God sent me good speed," he was like a raven bringing fire to his nest, courting disaster. For when Jacob said "the Lord your God sent me good speed," Isaac thought to himself that he knew that Esau did not customarily mention the name of God, and if the person before him did so, he must not have been Esau but Jacob. Consequently, Isaac told him in "Come near, I pray, that I may feel you, my son."