 The Sefer haYashar expands on this narrative, and says that when Hamor asked Dinah's hand for his son Shechem, Simeon and Levi, to outwit him, replied that some delay was necessary in order to consult their grandfather Isaac about the matter.After Hamor had gone it was Simeon who advised his brothers to require all the men of Shechem to be circumcised, and by this means place them at their mercy.The Sefer haYashar also has Simeon marrying his sister, Dinah.