Reference for Pesachim 79:8

א"ל ר"נ מאן דציית ליה לאבא אכיל נהמא דעיפושא דהא בי רב הונא לתתי ובי רבא בר אבין לתתי ורבא אמר אסור ללתות

Why particularly a conscientious man: even any other man<span class="x" onmousemove="('comment',' Lit., 'the whole world'.');">¹²</span> too, for surely it was taught: One may not wash barley on Passover? He says thus: He should not wash even wheat, which is hard.<span class="x" onmousemove="('comment',' And consequently is slower to ferment than barley. Others who are not so conscientious may moisten wheat, for only barley is forbidden in the Baraitha.');">¹³</span>

Jastrow