וְֽאֶת־הַצְּפוֹנִ֞י אַרְחִ֣יק מֵעֲלֵיכֶ֗ם וְהִדַּחְתִּיו֮ אֶל־אֶ֣רֶץ צִיָּ֣ה וּשְׁמָמָה֒ אֶת־פָּנָ֗יו אֶל־הַיָּם֙ הַקַּדְמֹנִ֔י וְסֹפ֖וֹ אֶל־הַיָּ֣ם הָאַֽחֲר֑וֹן וְעָלָ֣ה בָאְשׁ֗וֹ וְתַ֙עַל֙ צַחֲנָת֔וֹ כִּ֥י הִגְדִּ֖יל לַעֲשֽׂוֹת׃
我必使那從北方來的遠離你們，把它趕到乾旱荒涼之地：它的前頭趕向東海，後尾趕向西海；它的臭氣必上騰，它的腥臭必升起，因為它行了大事。
Mishneh Torah, Reading the Shema
If one, while walking, is reading the Shema and reaches a place where there is filth, he should not place his hand over his mouth and continue to read, but he must pause till he has passed the place.