Reference for Temurah 31:1

אמר רב יוסף

Said R'Joseph: [The word dofi here means] dispute, [e.g. , the dispute] relating to 'laying on of hands'.<span class="x" onmousemove="('comment',' The laying of hands on the animal previous to a sacrifice on a Festival, which was the very first subject over which there was a difference of opinion, the School of Shammai holding that it was permissible and the School of Hillel that it was not permissible. This controversy took place after the time of Joseph b. Jo'ezer.');">¹</span>

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