Exodus 33:11-23 (Holy Friday Vespers)
Thus the LORD used to speak to Moses face to face, as a man speaks to his friend. When Moses turned again into the camp, his servant Joshua the son of Nun, a young man, did not depart from the tent. Moses said to the LORD, "See, thou sayest to me, 'Bring up this people'; but thou hast not let me know whom thou wilt send with me. Yet thou hast said, 'I know you by name, and you have also found favor in my sight.' Now therefore, I pray thee, if I have found favor in thy sight, show me now thy ways, that I may know thee and find favor in thy sight. Consider too that this nation is thy people." And he said, "My presence will go with you, and I will give you rest." And he said to him, "If thy presence will not go with me, do not carry us up from here. For how shall it be known that I have found favor in thy sight, I and thy people? Is it not in thy going with us, so that we are distinct, I and thy people, from all other people that are upon the face of the earth?" And the LORD said to Moses, "This very thing that you have spoken I will do; for you have found favor in my sight, and I know you by name." Moses said, "I pray thee, show me thy glory." And he said, "I will make all my goodness pass before you, and will proclaim before you my name 'The LORD'; and I will be gracious to whom I will be gracious, and will show mercy on whom I will show mercy. But," he said, "you cannot see my face; for man shall not see me and live." And the LORD said, "Behold, there is a place by me where you shall stand upon the rock; and while my glory passes by I will put you in a cleft of the rock, and I will cover you with my hand until I have passed by; then I will take away my hand, and you shall see my back; but my face shall not be seen."