Rabbi Ẓe'era || said: There are five kinds of 'Orlah (things uncircumcised) in the world: four with reference to man, and one concerning trees. Whence do we know this concerning the four (terms) applying to man? (Namely,) the uncircumcision of the ear, the uncircumcision of the lips, the uncircumcision of the heart, and the uncircumcision of the flesh. Whence do we know of the uncircumcision of the ear?
Because it is said, "Behold, their ear is uncircumcised" (Jer. 6:10). Whence do we know of the uncircumcision of the lips? Because it is said, "For I am of uncircumcised lips" (Ex. 6:12). Whence do we know of the uncircumcision of the heart?
Because it is said, "Circumcise the foreskin of your heart" (Deut. 10:16); and (the text) says, "For all the nations are uncircumcised, and all the house of Israel are uncircumcised in heart" (Jer. 9:26). Whence do we know of the uncircumcision of the flesh? Because it is said, "And the uncircumcised male who is not circumcised in the flesh of his foreskin" (Gen. 17:14). And "all the nations are uncircumcised" in all the four cases, and "all the house of Israel are uncircumcised in heart."
The uncircumcision of the heart does not suffer Israel to do the will of their Creator. And in the future the Holy One, blessed be He, will take away from Israel the uncircumcision of the heart, and they will not harden their stubborn (heart) any more before their Creator, as it is said, "And I will take away the stony heart out of your flesh, and I will give you an heart of flesh" (Ezek. 36:26); and it is said, "And ye shall be circumcised in the flesh of your foreskin" (Gen. 17:11).
Whence do we know concerning the one ('Orlah) for trees? Because it is said, "And when ye shall come into the land, and shall have planted all manner of trees for food, then ye shall count the fruit thereof as their uncircumcision: three years shall they be as uncircumcised unto you" (Lev. 19:23).