Ein Yaakov (Glick Edition), Shevuot
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(דף כ ע״ב) תניא (שמות כ ז) זכור (דברים ה יא) ושמור בדבור אחד נאמרו מה שאין הפה יכול לדבר ומה שאין אוזן יכולה לשמוע:
En Jacob, translated by SH Glick, 1916
(Fol. 20b) We are taught in a Baraitha: The words Zachor (ye shall remember) [in the first ten commandments] and Shamor (ye shall observe) [in the second ten commandments] were uttered by the Lord in one word, which transcends the power of the human mouth and ear.