Genesis 29:33 records the birth and naming of Simeon (meaning 'heard'), the same son Jacob curses here for cruelty.

Genesis 29:34 records the birth and naming of Levi (meaning 'joined'), the same Levi Jacob curses for violence.

Genesis 34:25-31 recounts the slaughter of Shechem by Simeon and Levi, the violent act Jacob condemns in this blessing.

Genesis 34:31 records Simeon and Levi's defense that they avenged Dinah's honor — contrasting with Jacob's condemnation of their violence.

Genesis 34:30 shows Jacob's angry reaction to the massacre — he fears retaliation, setting up his later curse here.