וְאִם־לֹ֤א תִשְׁמְעוּ֙ בְּק֣וֹל יְהוָ֔ה וּמְרִיתֶ֖ם אֶת־פִּ֣י יְהוָ֑ה וְהָיְתָ֧ה יַד־יְהוָ֛ה בָּכֶ֖ם וּבַאֲבֹתֵיכֶֽם׃
but if ye will not hearken unto the voice of the LORD, but rebel against the commandment of the LORD, then shall the hand of the LORD be against you, and against your fathers.
Read halakhic rulings (Jewish law) on I Samuel 12:15: and classical halakhic sources.