Reference for Pesachim 221:10

א"נ נפתח בלא ונפסיק בלא

Again, this was said only if the sun had not passed over it nor did he walk sixty steps over it; but if the sun had passed over it and he walked sixty steps over it, it does not matter. Again, this was said only if he was not riding an ass and was not wearing shoes; but if he was riding an ass and was wearing shoes, it does not matter.

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