What does Genesis 42:35 mean?
Jacob's sons have just told him about their attempt to buy grain in Egypt (Genesis 42:1–5). The good news was that the Egyptian ruler had given them grain in the end. The bad news was that he also accused them of being spies, keeping Simeon on the demand they return with their youngest brother Benjamin to prove their story (Genesis 42:18–20). None of them yet realize this governor is their own brother, Joseph (Genesis 42:7–8), whom they'd sold as a slave twenty years ago (Genesis 37:28).Now they open their sacks to show Jacob the grain, also exposing the money they took with them to buy the grain. It's unclear if the brothers were surprised, or merely reminded of their own fear. They had discovered money in at least one of their sacks along the road back to Canaan (Genesis 42:27–28). It's not likely they did not check the rest of the sacks. It's possible they may have deceived Jacob once more by pretending to be surprised. However, there would be no reason for them to do. What's certain is that they don't know how Joseph ordered their money secretly returned to their sacks (Genesis 42:25).
Also certain is that they were all afraid, including Jacob. If the Egyptians believe they had not even paid for the grain they were given, they could be accused of stealing it and then imprisoned or killed. Their brother, Simeon, still in custody, could be punished for their crime. Going back with Benjamin, now, would be extremely risky. Jacob's response summarizes the pain these sons have caused for him (Genesis 42:36).