Reference for Menachot 67:2

אביי ורבא עבדי כרבה ורב יוסף ורב אשי עביד כרב ושמואל לחומרא והילכתא כרב ושמואל לחומרא

And the law is in accordance with the views of Rab and Samuel, adopting the stricter ruling. It was stated: As for a staircase which leads from one room to an upper room,<span class="x" onmousemove="('comment',' It was usual to place a door at the foot of the staircase or at the top so as to afford privacy to the tenants of the upper and lower floors. Sometimes a door was placed both at the foot and at the top of the staircase.');">²</span>

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