Surah Al-Isra 17:23

۞ وَقَضَىٰ رَبُّكَ أَلَّا تَعْبُدُوٓا۟ إِلَّآ إِيَّاهُ وَبِٱلْوَٰلِدَيْنِ إِحْسَـٰنًا ۚ إِمَّا يَبْلُغَنَّ عِندَكَ ٱلْكِبَرَ أَحَدُهُمَآ أَوْ كِلَاهُمَا فَلَا تَقُل لَّهُمَآ أُفٍّ وَلَا تَنْهَرْهُمَا وَقُل لَّهُمَا قَوْلًا كَرِيمًا

And your Lord has decreed that you worship not except Him, and to parents, good treatment. Whether one or both of them reach old age [while] with you, say not to them [so much as], "uff," and do not repel them but speak to them a noble word.

Translation: Saheeh International

Tafsir

And your Lord has decreed He has commanded that you worship none save Him and that you show kindness to parents by being dutiful to them. If they should reach old age with you one of them ahaduhumā is the subject of the verb or both a variant reading for yablughanna has yablughān ‘both should reach’ in which case …

Excerpt from Tafsir al-Jalalayn, commentary on 17:23, via Quran.com. The reader has the full commentary and 9 more tafsirs.