וַיִּטְמְא֥וּ בְמַעֲשֵׂיהֶ֑ם וַ֝יִּזְנוּ֗ בְּמַֽעַלְלֵיהֶֽם׃
Thus were they defiled with their works, And went astray in their doings.
Read halakhic rulings (Jewish law) on Psalms 106:39 from the Mishneh Torah and classical halakhic sources, free online.