Mesorat%20hashas for Taanit 34:1
כרבי מכלל דרבנן אסרי מ"ט מהרה יבנה בית המקדש ובעינן כהן הראוי לעבודה וליכא הכא אפשר דמספר ועייל
From this may be inferred that the Rabbis forbid [priests to drink wine], why? Perhaps the Temple may speedily be rebuilt and the need will arise for priests to do service therein and there will be none available; and so here too [in the case of letting the hair grow long] the Temple may speedily be rebuilt and the need will arise for priests fit for service and there will be none available]? - [This difficulty cannot arise] here this latter case] since it is always possible for a priest to cut his hair and then enter [the Temple].
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