In the third aliyah, when Yosef arrives where his brothers are, they strip him of his fancy coat and cast him into a pit. They subsequently sell him to a caravan traveling to Egypt where he is sold to Potifar, the captain of Pharaoh's guard. Meanwhile, the brothers dip Yosef's coat into blood, and show it to their father Yakov as evidence of Yosef's being devoured by a wild beast. Yakov then begins what Rashi points out will be 22 years of mourning while Yosef is missing. Rashi further says that these 22 years where Yosef doesn't honor his father by letting him know he is alive correspond to the 22 years that Yakov himself didn't communicate with Yitzchak his own father while Yakov was in Lavan's house.