תלמוד על עירובין 115:13

HALAKHAH: Paragraph. “One only measures with a rope of 50 cubits,” etc. How much is the measure of the Sabbath domain? 40 ropes. “Neither less” since it can be tightened and increases, “nor more” since it gets loose and loses¹¹⁶Babli 58 a.. Some Tannaim state, one measures with a linen rope, but some Tannaim state, with a chain rope¹¹⁷A metal chain., and some Tannaim state, with a rope of four cubits. ¹¹⁶Babli 58 a. Rebbi Joshua said, there is no truer measure than with chains, but what can I do since in Prophets it is written ropes, a linen twine was in his hand and a measuring rod¹¹⁸Ez. 40:3..