While you are walking to the synagogue on Shabbat, a Jewish driver stops his car and asks you how to drive to that synagogue. Is there any problem giving him the directions? Are you facilitating or encouraging him to do a melacha?
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1youtube.com/watch?v=UDvrplQqeQ4 – Double AA♦ May 9 '14 at 23:23
Rabbi Benjamin Yasgur quotes Nechama Leibowitz, who said that Rabbi Shlomo Zalman Auerbach ruled that yes, you are allowed to give him directions, for two reasons:
If you don't answer, the driver might commit additional violations if they choose the wrong way.
Not answering might create animosity (איבה) between Jews.
Source: TorahMusings.com
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1This was the practice of many great rabbis. Surprisingly, Rabbi Aaron Lichtenstein shlit'a is of the opinion that you apologize and say you don't know. – Shalom May 9 '14 at 22:35