The Quran root ن ص ح n-ṣ-ḥ

وَقَاسَمَهُمَا إِنِّي لَكُمَا لَمِنَ النَّاصِحِينَ ٢١

النَّاصِحِينَ l-nāṣiḥīna · the sincere advisors

And he swore [by Allāh] to them, "Indeed, I am to you from among the sincere advisors." (Surah Al-A'raf, 7:21)

أُبَلِّغُكُمْ رِسَالَاتِ رَبِّي وَأَنَا لَكُمْ نَاصِحٌ أَمِينٌ ٦٨

نَاصِحٌ nāṣiḥun · an adviser

I convey to you the messages of my Lord, and I am to you a trustworthy adviser. (Surah Al-A'raf, 7:68)

أُبَلِّغُكُمْ رِسَالَاتِ رَبِّي وَأَنصَحُ لَكُمْ وَأَعْلَمُ مِنَ اللَّهِ مَا لَا تَعْلَمُونَ ٦٢

وَأَنصَحُ wa-anṣaḥu · and [I] advise

I convey to you the messages of my Lord and advise you; and I know from Allāh what you do not know. (Surah Al-A'raf, 7:62)

وَلَا يَنفَعُكُمْ نُصْحِي إِنْ أَرَدتُّ أَنْ أَنصَحَ لَكُمْ إِن كَانَ اللَّهُ يُرِيدُ أَن يُغْوِيَكُمْ هُوَ رَبُّكُمْ وَإِلَيْهِ تُرْجَعُونَ ٣٤

نُصْحِي nuṣ'ḥī · my advice

And my advice will not benefit you - although I wished to advise you - if Allāh should intend to put you in error. He is your Lord, and to Him you will be returned." (Surah Hud, 11:34)

يَا أَيُّهَا الَّذِينَ آمَنُوا تُوبُوا إِلَى اللَّهِ تَوْبَةً نَّصُوحًا عَسَىٰ رَبُّكُمْ أَن يُكَفِّرَ عَنكُمْ سَيِّئَاتِكُمْ وَيُدْخِلَكُمْ جَنَّاتٍ تَجْرِي مِن تَحْتِهَا الْأَنْهَارُ يَوْمَ لَا يُخْزِي اللَّهُ النَّبِيَّ وَالَّذِينَ آمَنُوا مَعَهُ نُورُهُمْ يَسْعَىٰ بَيْنَ أَيْدِيهِمْ وَبِأَيْمَانِهِمْ يَقُولُونَ رَبَّنَا أَتْمِمْ لَنَا نُورَنَا وَاغْفِرْ لَنَا إِنَّكَ عَلَىٰ كُلِّ شَيْءٍ قَدِيرٌ ٨

نَّصُوحًا naṣūḥan · sincere

O you who have believed, repent to Allāh with sincere repentance. Perhaps your Lord will remove from you your misdeeds and admit you into gardens beneath which rivers flow [on] the Day when Allāh will not disgrace the Prophet and those who believed with him. Their light will proceed before them and on their right; they will say, "Our Lord, perfect for us our light and forgive us. Indeed, You are over all things competent." (Surah At-Tahrim, 66:8)