Midrash for Sanhedrin 130:13

שואל אוב היינו ודורש אל המתים

and one who consults a skull. What is the difference between them? — The dead conjured up by soothsaying does not ascend naturally [but feet first], nor on the Sabbath; whilst if consulted by its skull it ascends naturally and on the Sabbath too. [You say,] it ascends: but whither — does not the skull lie before him? — But say thus: It answers naturally,<span class="x" onmousemove="('comment',' I.e., not from between the necromancer's joints. ');">¹²</span>

Sifrei Devarim