כִּ֧י אִם־זְכַרְתַּ֣נִי אִתְּךָ֗ כַּאֲשֶׁר֙ יִ֣יטַב לָ֔ךְ וְעָשִֽׂיתָ־נָּ֥א עִמָּדִ֖י חָ֑סֶד וְהִזְכַּרְתַּ֙נִי֙ אֶל־פַּרְעֹ֔ה וְהוֹצֵאתַ֖נִי מִן־הַבַּ֥יִת הַזֶּֽה׃
אָבער זאָלסט מיך געדענקען בײַ זיך, אַז דיר װעט גוט זײַן, און זאָלסט טאָן, איך בעט דיך, אַ חסד מיט מיר, און מיך דערמאָנען פֿאַר פַּרעהן, און מיך אַרױסציען פֿון דעם דאָזיקן הױז.
Mishnah Eruvin
They measure the Shabbat limit only with a rope fifty cubits long, neither less nor more. And one should measure only while holding the end of the rope on a level with his heart. If he was measuring and he reached a valley or a wall he spans it and resumes his measuring. If he reached a hill he spans it and resumes his measuring, provided he does not go beyond the Shabbat limit. If he is unable to span it in connection with this Rabbi Dostai ben Yannai stated in the name of Rabbi Meir: “I have heard that they pierce the hills.”