Which letter of the alef-beis isn't found in bentching and what is its significance?
closed as not constructive by Isaac Moses♦ Jun 17 '11 at 21:48
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The Elya Rabba (Orach Chaim 185) notes that in Birchas Hamazon all the letters of the Aleph Beis appear with the exception of the "Ende Fei." The Elya Rabbah explains that according to the esoteric teachings of kabala the "Ende Fei" is associated with demons and harmful spirits. Chazal purposely omitted the "Ende Fei" to underscore that the intense holiness of this blessing does not allow for a trace of anything harmful or impure.