Commentary for Bava Metzia 155:4

איתיביה רבא לרב נחמן עד ארבעים וחמשים זוז אמר ליה כי תניא ההיא שבאתה חבילה לידו

— He replied: That was taught only if the bundle [of the workers, tools, etc.] had come into his possession.<span class="x" onmousemove="('comment',' Only if actually in possession of property belonging to the workers may he engage fresh ones at their expense up to the value thereof, even if it exceeds the original amount; but not otherwise. ');">⁶</span> <b><i>MISHNAH</i></b>. IF ONE HIRES AN ASS TO DRIVE IT ON THE MOUNTAIN [TOP]. BUT DRIVES IT ON THE PLAIN, OR TO DRIVE IT ON THE PLAIN BUT DRIVES IT ON THE MOUNTAIN. EVEN IF BOTH ARE TEN MILS,<span class="x" onmousemove="('comment',' A mil = 2000 cubits. ');">⁷</span>

Rashi on Bava Metzia