Responsa for Pesachim 79:10

הדר אמר רבא מותר ללתות דתניא יוצאין בפת נקיה והדראה ואי אפשר נקיה בלא לתיתה

But Raba said: It is forbidden to wash [wheat]. But what of what was taught: You may not wash barley on Passover, [implying] barley only may not [be washed], but wheat is permitted? - He leads to a climax!<span class="x" onmousemove="('comment',' Lit., 'he states, it is unnecessary " (to="" teach="" etc.)="" "'.');"="">¹⁶</span> It is unnecessary [to teach about] wheat, for since it has splits the water enters it;<span class="x" onmousemove="('comment',' And certainly causes it to ferment.');">¹⁷</span>

Teshuvot Maharam