Reference for Sanhedrin 59:23

והתניא גמרו את הדבר מכניסין את העדים ההיא דלא כרבי נתן

he [the dissentingjudge] must pay his share;<span class="x" onmousemove="('comment',' For without him, the remaining two could not have issued such a decree. ');">²²</span>

Jastrow