Musar zu Schemot 9:29
וַיֹּ֤אמֶר אֵלָיו֙ מֹשֶׁ֔ה כְּצֵאתִי֙ אֶת־הָעִ֔יר אֶפְרֹ֥שׂ אֶת־כַּפַּ֖י אֶל־יְהוָ֑ה הַקֹּל֣וֹת יֶחְדָּל֗וּן וְהַבָּרָד֙ לֹ֣א יִֽהְיֶה־ע֔וֹד לְמַ֣עַן תֵּדַ֔ע כִּ֥י לַיהוָ֖ה הָאָֽרֶץ׃
Aber Mose sprach zu ihm: Wie ich aus der Stadt gehe, werde ich meine Hände ausbreiten zum Herrn, der Donner wird dann aufhören und der Hagel ferner nicht sein, damit du erkennest, dass dem Herrn das Weltall ist;
Shenei Luchot HaBerit
כצאתי את העיר אפרוש את כפי. Moses did not pray inside the capital of Egypt since the city was filled with idols. This teaches the Jewish traveller who on occasion is forced to use inns and hotels owned by pagans which may prominently display icons or pigs, etc., to be careful to choose only locations that are free from these when he says his prayers. On occasion it may be preferable to pray en route rather than in such surroundings.
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