Reference for Menachot 190:14

אלא מאי דרך חול דקא אמר להו הכי קא אמרו ליה ליכא לחם כי אם לחם הפנים המוסרים מלפני ה'

it will become invalid by being kept overnight!<span class="x" onmousemove="('comment',' It is therefore wrong to bake the Shewbread on a weekday.');">¹⁷</span> R'Simeon maintains that he found them baking it on the Sabbath and said to them, Should you not have baked it on a weekday?

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