S4, E1 וירא יח:א-ג. חורבן סדום ולידת יצחק

Avraham learnt how to see Hashem after he circumcised. 

Upon seeing the three men on their way to Sodom he stopped them and invited them to eat, thereby connecting his own destiny with them and their divine mission of destroying Sodom.

Sources:

ישעיהו נא:א-ו

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