俱舍論疏 12.12

12.12

論「二十四指至中間道量」，明後四量。古時一弓有八尺者，即是古尋。今時有六尺已下，即六尺步法。今時多用五尺步法。「俱盧舍」，是人、牛聲不及處所，無聲喧雜處，梵名阿練若。阿是言無，練若名喧雜。若以八尺為尋計之，五百弓量即是四千尺。若以六尺計之，即有三千尺也。若以一肘一尺六寸計一弓量，即有六尺四寸。昔時造論，故應八尺計之。

On the Śāstra's words, "Twenty-four fingers [...] the measure of intermediate paths": Explaining the latter four measures. In ancient times, one bow was eight chi, which is the ancient xun. Nowadays there are those of six chi and below, which is the six-chi bu method. Nowadays the five-chi bu method is mostly used. "Krośa" is a place not reached by the sound of humans or oxen, a place free of noisy clamour; in Sanskrit it is called araṇya. "A" means non-, and "raṇya" means noisy clamour. If calculated using eight chi as a xun, the measure of five hundred bows is four thousand chi. If calculated using six chi, it is three thousand chi. If one calculates a bow by one cubit (hasta) being one chi and six cun, then it is six chi and four cun. Because the treatise was composed in ancient times, one should calculate it by eight chi.