Reference for Eruvin 199:15

ואיבעית אימא הא והא בשוגג והכא בקנסו שוגג אטו מזיד קמיפלגי מר סבר קנסינן ומר סבר לא קנסינן

is to be sprinkled four times. If that which has to be sprinkled four times was confused with that which has to be sprinkled once, R'Eliezer ruled: Each<span class="x" onmousemove="('comment',' Cf. Bertinoro l.c.');">⁴²</span> must be sprinkled four times,<span class="x" onmousemove="('comment',' The superfluous sprinklings in the case of the latter being regarded as those of mere water that can in no way affect the prescribed number.');">⁴⁴</span> and R'Joshua ruled: Each<span class="x" onmousemove="('comment',' Cf. Bertinoro l.c.');">⁴²</span>

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