“And they related to him all the words of Yosef that he had spoken to them, and he saw the wagons that Yosef had sent to transport him; then the spirit of their father Yaakov was revived.”
“And Yaakov became very frightened, and it caused him much pain, and he split the nation that was with him, as well as the sheep, the cattle, and the camels, into two camps.”
The Bach, commenting on the Tur Shulchan Aruch, explains that the decrees of the Y’vanim against the Jewish People occurred because the Jewish People became “lax in their service.”
“These are the offspring of Yaakov: Yosef, at the age of 17 years, was a shepherd with his brothers by the flock, and he was a youth with the sons of Bilhah and the sons of Zilpah, his father’s wives; and Yosef would bring evil reports of them to their father.”