תָּכִ֣ין לְךָ֮ הַדֶּרֶךְ֒ וְשִׁלַּשְׁתָּ֙ אֶת־גְּב֣וּל אַרְצְךָ֔ אֲשֶׁ֥ר יַנְחִֽילְךָ֖ יְהוָ֣ה אֱלֹהֶ֑יךָ וְהָיָ֕ה לָנ֥וּס שָׁ֖מָּה כָּל־רֹצֵֽחַ׃
你要為自己預備道路，又要將永恆者你的上帝使你承受為業之地的全境分為三段，好使一切殺人的都可以逃到那裡。
Mishnah Shekalim
On the first of Adar they make a public announcement about the shekels and concerning kilayim. On the fifteenth: they read the Megillah [Esther] in walled cities, and they fix the roads and the streets and the ritual water baths, and they perform all public duties, and they mark the graves, and [messengers] go forth also concerning kilayim.
Mishnah Makkot
And direct roads were made leading from one to the other, as it says, “You shall prepare the way and divide the borders of your land into three parts” (Deut. 19:3). And they delegate to him two disciples of the Sages [as escorts] in case anyone attempted to slay him on the way, and that they might speak to him. Rabbi Meir says: “He may [even] plead his cause himself, as it says, “And this is the word of the manslayer” (Deut. 19:4).