 The Mishnah taught that the absence of one of the two portions of scripture in the mezuzah — and — invalidates the other, and indeed even one imperfect letter can invalidates the whole.The Mishnah taught that the absence of one of the four portions of scripture in the Tefillin — and 11–16 and and — invalidates the others, and indeed even one imperfect letter can invalidate the whole.Reading "Hear, O Israel, the Lord our God, the Lord is One," the Rabbis taught that God told Israel that all that God had created, God created in pairs