קבלה אויף שמות 1:6

Neither did the exile really commence during the life-time of Joseph, since he was the image of his father, but as soon as he died the captivity began in earnest, as it says: “And Joseph died… come, let us deal wisely with them… and they made their lives bitter with hard service, in mortar and in brick, etc.” (Ex. 1, 6-14).