מוסר אויף בראשית 32:2

It is related in Zohar Chadash, Parashas Noach (26b): Rabbi Elazar and his father-in-law Rabbi Yose were traveling from Usha to Lud. Rabbi Yose said to Rabbi Elazar, “Did you happen to hear from your father, Rabbi Shimon ben Yochai, what is meant by the verse, ‘And Yaakov went on his way and angels of God met him’ (Bereishis 32:2)? Who were these angels?” “I do not know…,” he replied. While they were yet traveling they noticed a certain cave and heard a voice saying, “There were two fawns of a gazelle that brought Me pleasure. They were the holy camp that met Yaakov and then went before him.” Rabbi Elazar became extremely agitated and fearful. “Master of the Universe!” he said, “Is this Your way? It would have been better had we not heard this, for now that we have heard it we still do not know who they were!” Then a miracle occurred and they heard a voice saying, “They were Avraham and Yitzchak.”