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Parsha Mikeitz records the whole affair between Yosef and the brothers when they came to Mitzrayim to buy food and were accused by the Viceroy of being spies. We learned how after hearing their story and family history, Yosef demanded that they bring their youngest brother to him and incarcerated Shimon as insurance that the brothers would indeed return with Binyamin, their youngest brother. We learn that in the middle of Parsha Mikeitz, with the imprisonment of Shimon, the brothers recognized and attributed their predicament to the sin they had committed earlier by throwing Yosef into the pit and then selling him to the Mitzriyim. Yosef heard and understood their conversation and left their presence to cry silently. (Perek 42, posukim 21-24)
