Reference for Yoma 59:7
<big><strong>גמ׳</strong></big> שאלו את בן זומא טבילה זו למה אמר להם ומה המשנה מקודש לקודש וממקום שענוש כרת למקום שענוש כרת טעון טבילה המשנה מחול לקודש וממקום שאין ענוש כרת למקום שענוש כרת אינו דין שטעון טבילה
but as to eating he may wash his hands outside and re-enter, people know that he is fastidious of taste.<span class="x" onmousemove="('comment',' The average man is assumed to be fastidious enough not to eat without his fingers having been washed before, esp. since eating with the fingers (rather than with fork and knife) was the general custom. V.T.A. III, p. 43.');"><sup>13</sup></span> R'Nahman B'Isaac said: I would do the same<span class="x" onmousemove="('comment',' And wash my hands outside.');"><sup>14</sup></span> before drinking as people know me to be fastidious.