Hadith 31-160

وَبِهذَا الإِسناد عَنْ جَعْفَرِ بْنِ مُحَمَّد عَلَيْهِ السَّلامُ أَنَّهُ قالَ: أَدنِى العُقُوق أُفٍّ وَلَوْ عَلِمَ اللَّه شَيئاً أَهوَنَ مِنَ الأُفِّ لَنَهى‏ عَنْهُ.

According to the same documentation, it is narrated that Ja’far ibn Muhammad (a.s.) said, “The lowest level of being damned by parents is through telling them a word of contempt. [46] If God knew anything lower than this, He would have admonished us against it.”