Chazal teach us that Yosef had a specific motivation in sending “agalos,” wagons. The Hebrew word “agalah,” wagon, is similar to the word “eglah,” calf. Yosef intended to provide a hint to Yaakov, referring to the laws of the eglah arufah (the calf which was killed as a symbol of the innocence of the elders of a city where a murder had been committed), which was the last section of halachah that Yosef had studied with Yaakov. He thereby demonstrated to his father that he had not forgotten his studies. Also, Yosef had taken leave of his father without escort…
