Reference for Shabbat 119:8

<big><strong>גמ׳</strong></big> סנדל המסומר מאי טעמא

and this [a signet ring] is a utensil. But the Sabbath [interdiction] was imposed by the Divine Law on account of the burden: if it has no signet, it is an ornament; if it has a signet, it is a burden.

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