וּמִֽזַּרְעֲךָ֥ לֹא־תִתֵּ֖ן לְהַעֲבִ֣יר לַמֹּ֑לֶךְ וְלֹ֧א תְחַלֵּ֛ל אֶת־שֵׁ֥ם אֱלֹהֶ֖יךָ אֲנִ֥י יְהוָֽה׃
And thou shalt not give any of thy seed to set them apart to Molech, neither shalt thou profane the name of thy God: I am the LORD.
Read kabbalistic (mystical) interpretation of Leviticus 18:21: and classical mystical sources.