Halakhah for Bava Metzia 214:5

ר' יוסי בר חנינא אמר זו צואה דאמר מר צואת החוטם וצואת האוזן רובן קשה ומיעוטן יפה

This is in accordance with his opinion [expressed elsewhere]. For Rab went up to a cemetery, performed certain charms,<span class="x" onmousemove="('comment',' Lit., 'did what he did,' and so translated by Rashi. By means of whispering certain charms over the graves he learnt what had caused the death of their occupants. ');">⁴</span>

Kitzur Shulchan Arukh