to a fascinating exploration of just that, as we unpack a verse from Genesis and see what the Rabbis of old found hidden within its folds.

Our journey begins with the powerful words from Genesis 17:13: “You shall surely circumcise those born in your house, or those purchased with your silver, and My covenant shall be in your flesh for an eternal covenant.” It’s a verse about brit milah, the covenant of circumcision, a cornerstone of Jewish identity. But it's the seemingly simple phrase "You shall surely circumcise" – himol yimol in Hebrew – that truly sparks our curiosity. Why the double expression? What secrets does it hold?

The Rabbis of Bereshit Rabbah, that magnificent collection of Midrashim on the Book of Genesis, didn’t miss a thing. They saw in this repetition a key to understanding the depth and breadth of this sacred act.

The double expression, himol yimol, teaches us, first and foremost, about circumcision itself. But not just the cutting. It refers, says the Midrash, to both the circumcision and the uncovering – that is, peeling back the membrane under the foreskin to expose the corona. And there's more! It also refers to the circumcision and the removal of any remaining shreds of skin. It's a thorough and meticulous process, highlighting the care and precision required in fulfilling this commandment.

But the Rabbis don’t stop there. Himol yimol also teaches us that the one performing the circumcision, the mohel, must himself be circumcised! A fascinating detail, emphasizing the importance of personal connection to the covenant.

And what about a child who is born already circumcised? Bereshit Rabbah anticipates this question. The double expression includes even one who was born circumcised! But wait, how can you circumcise someone who's already circumcised? The answer lies in drawing a drop of "covenantal blood" – a symbolic act signifying entry into the covenant, even when the physical act of circumcision isn't possible.

This leads us to a debate between the schools of Beit Shammai and Beit Hillel, two prominent rabbinic schools known for their differing interpretations of Jewish law. Rabbi Shimon ben Elazar tells us that both schools agree that drawing covenantal blood is necessary for a child born circumcised, acknowledging that there is an undeveloped foreskin, compressed to the skin, even if it's not immediately visible. The disagreement arises, according to Rabbi Shimon ben Elazar, when it comes to a proselyte – someone converting to Judaism – who is already circumcised. Beit Shammai maintains that covenantal blood must be drawn, while Beit Hillel argues that it’s not necessary.

However, Rabbi Eliezer son of Rabbi Yosei HaGelili offers a different perspective. He suggests that Beit Shammai and Beit Hillel actually agree that covenantal blood is required in both cases – the child born circumcised and the circumcised convert. Where they truly disagree, says Rabbi Eliezer, is regarding a child born circumcised whose eighth day – the day of circumcision – falls on Shabbat, the Sabbath. Beit Shammai believes the covenantal blood must still be drawn, even if it means potentially violating the Sabbath, while Beit Hillel forbids desecrating Shabbat for this purpose, suggesting it should be postponed.

Ultimately, Rabbi Yitzchak, citing Rabbi Hoshaya, concludes that the halakha, the Jewish law, follows the opinion of the disciple – in this case, Rabbi Shimon ben Elazar.

So, what do we take away from this deep dive into a single phrase? It's a testament to the power of rabbinic interpretation, their ability to unpack layers of meaning from seemingly simple words. It reveals the multifaceted nature of brit milah, encompassing physical acts, symbolic gestures, and legal considerations. It shows us the dynamism of Jewish law, with different schools of thought engaging in passionate debate to arrive at a deeper understanding of God's will.

And perhaps most importantly, it reminds us that even the most ancient traditions are constantly being reinterpreted and re-understood, ensuring their continued relevance and vitality for generations to come. What other hidden depths might we uncover if we looked closer at the words we take for granted?