וַיֵּ֥שֶׁב יִשְׂרָאֵ֖ל בַּשִּׁטִּ֑ים וַיָּ֣חֶל הָעָ֔ם לִזְנ֖וֹת אֶל־בְּנ֥וֹת מוֹאָֽב׃
And Israel abode in Shittim, and the people began to commit harlotry with the daughters of Moab.
Read halakhic rulings (Jewish law) on Numbers 25:1: and classical halakhic sources.