".... Lavan was informed that Yaakov had fled. He took his relatives with him and pursued him" [Vayeitze 31:22,23] The Maggid of Mezritch taught: "Yaakov had left behind letters from the Torah which he had not yet extracted from Lavan. This is why Lavan pursued him - to give him the letters which remained with him.  An entire chapter was added to the Torah by these letters."  [Ohr Hame'ir