فَلَا تَقُلْ لَهُمَا أُفٍّ
Do not even say “uff” to your parents.
The wording directly forbids this minor expression of disrespect. The prohibition of a more severe injury is understood by dalalat al-nass, because the intelligible basis of the original prohibition is harm and disrespect. The extension does not depend on the more severe act being named explicitly; it follows from the evident meaning of the prohibition.
Opening interactive controls...
Advanced Applied Usul: Testing Evidence and Inference (Supplementary)
فَلَا تَقُلْ لَهُمَا أُفٍّ
Do not even say “uff” to your parents.
The wording directly forbids this minor expression of disrespect. The prohibition of a more severe injury is understood by dalalat al-nass, because the intelligible basis of the original prohibition is harm and disrespect. The extension does not depend on the more severe act being named explicitly; it follows from the evident meaning of the prohibition.