וְגַם֙ נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר וְלֹ֣א יִנָּחֵ֑ם כִּ֣י לֹ֥א אָדָ֛ם ה֖וּא לְהִנָּחֵֽם׃
And also the Glory of Israel will not lie nor repent; for He is not a man, that He should repent.’
Read halakhic rulings (Jewish law) on I Samuel 15:29: and classical halakhic sources.