ʿUyūn akhbār al-Riḍā
Hadith 160160 - وَبِهذَا الإِسناد عَنْ جَعْفَرِ بْنِ مُحَمَّد عَلَيْهِ السَّلامُأَنَّهُ قالَ: أَدنِى العُقُوق أُفٍّ وَلَوْ عَلِمَ اللَّه شَيئاً أَهوَنَ مِنَ الأُفِّ لَنَهى عَنْهُ.
31-160 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. If God knew anything lower than this, He would have admonished us against it.”