Reference for Rosh Hashanah 48:9

שאני ר"ג דאחרים עשו לו והא רב יהודה דאחרים עשו לו וא"ל שמואל לרב יהודה שיננא סמי עיניה דדין

If for serving, then the tiniest worm should also [be prohibited]? - Yes, that is so, as it has been taught: Which are in the earth:<span class="x" onmousemove="('comment',' Ex. XX, 4.');">¹¹</span> this brings under the rule mountains, hills, seas, rivers, streams and valleys.

Jastrow