Tanchuma Naso sec 16 Tanya Likkutei Amarim beginning of chapter 36

Tanchuma, “Naso,” sec. 16; Tanya, “Likkutei Amarim,” beg. of ch. 36.

{Lit. grace, but also an acronym for “Chochmah Nisteres,” the hidden wisdom.}

As he wrote in the introduction to his Torah commentary.