1) The famine in Canaan was still severe, so Judah convinced Jacob to send them back to Egypt to buy more food.
2) Jacob sent them with gifts of balms, spices, nuts, and double the money to return with Benjamin this time as Joseph had demanded.
3) When they arrived, Joseph treated them to a meal in his home and questioned them about their father, pretending not to know Benjamin. He then had his silver cup planted on Benjamin so it would appear he stole it.