Negative commandment · Lo Ta’aseh #7 of 613
Not to offer one's son to Molech
שלא להעביר למולך
The verse · Vayikra 18:21
וּמִזַּרְעֲךָ לֹא־תִתֵּן לְהַעֲבִיר לַמֹּלֶךְ וְלֹא תְחַלֵּל אֶת־שֵׁם אֱלֹהֶיךָ אֲנִי ה׳
“And thou shalt not let any of thy seed pass through (the fire) to Molekh, neither shalt thou profane the name of thy God: I am the Lord.”
The Rambam’s words
Not to offer one's son to Molech, as [Leviticus 18:21] states: "Do not give [any] of your children to offer to Molech."
שלא להעביר למולך, שנאמר "ומזרעך לא תיתן, להעביר למולך" (ויקרא יח,כא).
Why · Sefer HaChinuch #208
That we should not give from our seed to Molekh
“The root of this commandment is revealed and known.”
Who & when
“And it is practiced in every place and at all times by males and females (Sifra, Kedoshim, Section 4:1).”
Where in the Mishneh Torah
Hilchot Foreign Worship and Customs of the Nations הלכות עבודה זרה וחוקות הגויים