In Masechet Sanhedrin, Perek Zayin, Mishnah Zayin, we mentioned in Mishnah Dalet all the different sins that a person gets sekilah (stoning) for, including somebody who is noten mizar'o laMolech, who hands over his children to Molech. In the Kena'ani (Canaanite) world, they would have some sort of ritual where they had a statue called Molech. They didn't view Molech as a god, as we could actually infer from that Mishnah. We mentioned Avodah Zarah (idolatry), and then also somebody who is noten mizar'o laMolech. So this is not part of Avodah Zarah. It was an ancient practice where they would light a fire in front of the statue, and the father would hand his child over to the priest. Then the priest would hand the child back, and the father would have the child go through the fire from one side to the other, trying not to burn him. But of course, there would be situations where the child would burn and die. It was such a depraved, crazy practice that the Torah tells us that that person is chayav mitah: he is put to death by sekilah for performing this practice. Here we'll elaborate more on what they did.
The Mishnah says somebody who gives one of his children to Molech is not chayav, is not obligated in execution, unless he hands the child over to the priest of Molech and then passes the child through the space over the fire. Masar laMolech ve'lo he'evir ba'esh (he handed over to Molech but did not pass through fire). He'evir ba'esh ve'lo masar laMolech (he passed through fire but did not hand over to Molech). But if he didn't have both of those components—for example, if he handed the child over to the priest but didn't have the child go over the fire, or the opposite, if he had the child go over the fire but never handed the child off to the priests of Molech—eino chayav, he would not be liable, ad sheyimsor laMolech veya'avir ba'esh, until he did both. He handed over the child to the priests of Molech, and then he had the child pass over the fire.
Ba'al ov. We mentioned an ov and a yid'oni in the Mishnah as well, for sekilah. So what is an ov? Zeh pitom. That's somebody who is a fortune teller. He takes a bone, a piece of a skull, burns ketoret (incense) for it, and then starts asking questions about the future and receives answers. Hamedaber mi'shechyo. This is somebody who raises the spirits of a dead person, and that dead person speaks from the armpit of this fortune teller. Ve-yid'oni. Somebody who's a yid'oni. Zeh hamedaber befiv. It's somebody who takes the bone of an animal, puts it in his mouth, and then that bone speaks from his mouth. Harei elu b'sekilah. These people are punished by stoning. Ve'hanish'al ba'hem be'azharah. Somebody who asks them a question about the future. He wants to know something. He wants to use the ov or the yid'oni. He violates a prohibition, but we do not put him to death.