Halakhah for Sanhedrin 103:22

From the laws of the commandment is that which they, may their memory be blessed, said (Sanhedrin 52b) "The commandment of those that were burned is that they would submerge him in dung up to his knees, and they place a rough scarf within a soft one, and wrap [them] around his neck." And his two witnesses, "this one pulls toward himself, and that one pulls toward himself, until he opens his mouth." And they melt the tin or the lead or what is similar to it, "and [someone] throws it into his mouth, and it goes down and burns his intestines." And the rest of its details are in the seventh chapter of Sanhedrin.