Reference for Zevachim 188:1

כרים וכסתות דרכין נינהו ותנן היתה של עור נותן עליה מים עד שתכלה אלא אמר רבא כל כיבוס דלית ליה כיסכוס לא שמיה כיבוס

pillows and bolsters are soft, yet we learnt: 'If it is of leather, water is poured over it until it disappears'?<span class="x" onmousemove="('comment',' Supra in connection with the Sabbath.');">¹</span> - Rather said Raba: All washing without rubbing is not called washing. And as to R'Hiyya B'Ashi's statement, I stood many times before Rab and dabbed his shoes with water; dabbing is [permitted], but not rubbing.

Jastrow

Jastrow

Jastrow