Reference for Bava Kamma 147:5

ודקא אפכינן ואזמינהו

R. Aha the son of R. Ika said to R. Ashi: Whence could Raba prove this point?<span class="x" onmousemove="('comment',' Even according to his interpretation that three sets of witnesses took part in the controversy. ');">⁵</span>

Jastrow