Reference for Nedarim 41:4

אמר ליה רבינא לרב אשי אמר לו טפי מסלע והלה אמר בציר משקל נדרא הוי או זירוזין הוי

Raba said: You may even say, The Rabbis. Does the Mishnah teach, both [subsequently] agreed — it teaches, BOTH ARE AGREED.<span class="x" onmousemove="('comment',' Thus, neither meant the vow seriously at all; but the conditional vow of neziroth was really meant. ');">⁴</span>

Jastrow