Deuteronomy 19:7 Midrash

עַל־כֵּ֛ן אָנֹכִ֥י מְצַוְּךָ֖ לֵאמֹ֑ר שָׁלֹ֥שׁ עָרִ֖ים תַּבְדִּ֥יל לָֽךְ׃ (ס)

Wherefore I command thee, saying: ‘Thou shalt separate three cities for thee.’

Read midrashic interpretation of Deuteronomy 19:7: and classical rabbinic exegesis.