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The Talmud asks a very similar question, on Sanhedrin 71a:

אלא לא היה ולא עתיד להיות ולמה נכתב דרוש וקבל שכר [...] תניא, עיר הנדחת לא היתה ולא עתידה להיות ולמה נכתבה דרוש וקבל שכר [...]תניא בית המנוגע לא היה ולא עתיד להיות ולמה נכתב דרוש וקבל שכר

However, this [the Ben Sorrer Umoreh, the rebellious son of [t Deut. 21 18 u]]Deut. 21:18] never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that. [...] It was taught in a braysa, "Ir haNidachas" (a city that has been devoted to idol worship, that must be destroyed) never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that. [...] It was taught in a braysa, the (tzaraas) afflicted house never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that.

( translation mine )

It appears that even though learning certain laws are not practically applicable, there is still cause to learn them, as part of the mitzvah of Torah learning.

The Talmud asks a very similar question, on Sanhedrin 71a:

אלא לא היה ולא עתיד להיות ולמה נכתב דרוש וקבל שכר [...] תניא, עיר הנדחת לא היתה ולא עתידה להיות ולמה נכתבה דרוש וקבל שכר [...]תניא בית המנוגע לא היה ולא עתיד להיות ולמה נכתב דרוש וקבל שכר

However, this [the Ben Sorrer Umoreh, the rebellious son of [t Deut. 21 18 u]] never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that. [...] It was taught in a braysa, "Ir haNidachas" (a city that has been devoted to idol worship, that must be destroyed) never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that. [...] It was taught in a braysa, the (tzaraas) afflicted house never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that.

( translation mine )

It appears that even though learning certain laws are not practically applicable, there is still cause to learn them, as part of the mitzvah of Torah learning.

The Talmud asks a very similar question, on Sanhedrin 71a:

אלא לא היה ולא עתיד להיות ולמה נכתב דרוש וקבל שכר [...] תניא, עיר הנדחת לא היתה ולא עתידה להיות ולמה נכתבה דרוש וקבל שכר [...]תניא בית המנוגע לא היה ולא עתיד להיות ולמה נכתב דרוש וקבל שכר

However, this [the Ben Sorrer Umoreh, the rebellious son of Deut. 21:18] never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that. [...] It was taught in a braysa, "Ir haNidachas" (a city that has been devoted to idol worship, that must be destroyed) never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that. [...] It was taught in a braysa, the (tzaraas) afflicted house never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that.

( translation mine )

It appears that even though learning certain laws are not practically applicable, there is still cause to learn them, as part of the mitzvah of Torah learning.

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The Talmud asks a very similar question, on Sanhedrin 71a:

אלא לא היה ולא עתיד להיות ולמה נכתב דרוש וקבל שכר [...] תניא, עיר הנדחת לא היתה ולא עתידה להיות ולמה נכתבה דרוש וקבל שכר [...]תניא בית המנוגע לא היה ולא עתיד להיות ולמה נכתב דרוש וקבל שכר

However, this [the Ben Sorrer Umoreh, the rebellious son of [t Deut. 21 18 u]] never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that. [...] It was taught in a braysa, "Ir haNidachas" (a city that has been devoted to idol worship, that must be destroyed) never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that. [...] It was taught in a braysa, the (tzaraas) afflicted house never happened, and never will happen. If so, why was it written (in the Torah)? So we should learn the laws and accept reward for that.

( translation mine )

It appears that even though learning certain laws are not practically applicable, there is still cause to learn them, as part of the mitzvah of Torah learning.