The Midrash (Bereshit Rabba 84:8) says
ר' נחמיה אמר שכל הלכות שמסרו שם ועבר ליעקב מסרן לו
All the laws that Yaakov learned by Shem and Ever, he taught to Yosef (his son).
What exactly did Yaakov learn? And why did he teach it only to Yosef?
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