Reference for Yoma 105:15

אלא הכי קאמר אין לי אלא ביום הכפורים בשאר ימות השנה מניין ת"ל וכסה

To teach us that, Scripture said: 'So that it may cover [etc.]'. R'Ashi said: One [passage] refers to the commandment, the other to its indispensableness.<span class="x" onmousemove="('comment',' 'So that it may cover' is the command. He shall not come at all times ... for in a cloud shall I appear - and not otherwise is the prohibition that the incense is indispensable.');">¹⁷</span>

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