"The punishment for this [shaving with a razor] is delineated by the holy Zohar and the books of the Mekubalim, and is considered a great and terrible sin, among the most grievous." -- Shaving With a Razor, by Rabbi Meir Gavriel Elbaz, http://halachayomit.co.il/EnglishDefault.asp?HalachaID=2355, dated Jan. 4, 2012.
" And in truth, according to the [kabbalistic] writings and books of holiness, even destruction by other methods permitted by law is also a very, very tremendous blemish, God spare us; the Merciful One save us from that punishment." – s:Likutei Halakhot Yoreh Deah#Hilkhot Giluach
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Stern, Marc D. (2002). "On Egalitarianism and Halakha". Tradition: A Journal of Orthodox Jewish Thought. 36 (2): 1–30. ISSN0041-0608. JSTOR23262379.