How Abraham Knew Where to Circumcise From God's Covenant Hint

Midrash Tanchuma Buber, Lech Lecha 27:1

"And I will make My covenant between Me and you" (Genesis 17:2). Rabbi Hanina ben Pazzi said: Abraham did not know from where he was to be circumcised. The Holy One, blessed be He, gave him a hint and told him from where he was to be circumcised, as it continues, "and I will multiply you" (Genesis 17:2) — from the place from which you are fruitful and multiply. Bar Kappara said: Abraham expounded a kal va-chomer (an argument from minor to major). Just as trees — from where are they obligated in regard to the foreskin (orlah)? From the place where they produce fruit. So too I, from the place where I produce fruit I am obligated to be circumcised.

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