Talmud for Shabbat 184:9
באמת אמרו האשה כו': [תנא כל באמת הלכה היא: רבי יהודה אומר אף מקבלי פתקין]: תנא) שכן לבלרי מלכות עושין כן
Then on your reasoning, when they say to him, 'Do you not admit,' does it follow that R. Judah holds him, culpable! But surely it was taught: With the back of his hand or his foot, all agree that he is not culpable! Rather [conclude thus: if one intends to carry out an object] behind him and it comes behind him, all agree that he is culpable; with the back of his hand or foot, all agree that he is not culpable. They differ when [he carries it out] in his belt with its opening below: one Master likens it to [intending to carry it out] behind him and it comes behind him, while the other Master likens it [to carrying] with the back of one's hand or foot. IN TRUTH IT WAS SAID: A WOMAN, etc. It was taught: Every [statement of] 'In truth [etc.]' is the <i>halachah</i>.<span class="x" onmousemove="('comment',' V. B.M. 60a. ');"><sup>15</sup></span>