The mountain — That is, to some of the mountains wherewith Jericho was encompassed, in which also there were many caves where they might lurk. Three days — Not three whole days, but one whole day, and part of two days.
Related Commentaries of Joshua 2:16
Joshua 2:16
16 And she said unto them, Get you to the mountain, lest the pursuers meet you; and hide yourselves there three days, until the pursuers be returned: and afterward may ye go your way.