The Quran root ط ه ر ṭ-h-r

وَإِذْ جَعَلْنَا الْبَيْتَ مَثَابَةً لِّلنَّاسِ وَأَمْنًا وَاتَّخِذُوا مِن مَّقَامِ إِبْرَاهِيمَ مُصَلًّى وَعَهِدْنَا إِلَىٰ إِبْرَاهِيمَ وَإِسْمَاعِيلَ أَن طَهِّرَا بَيْتِيَ لِلطَّائِفِينَ وَالْعَاكِفِينَ وَالرُّكَّعِ السُّجُودِ ١٢٥

طَهِّرَا ṭahhirā · [You both] purify

And [mention] when We made the House [i.e., the Kaʿbah] a place of return for the people and [a place of] security. And take, [O believers], from the standing place of Abraham a place of prayer. And We charged Abraham and Ishmael, [saying], "Purify My House for those who perform ṭawāf and those who are staying [there] for worship and those who bow and prostrate [in prayer]." (Surah Al-Baqarah, 2:125)

وَإِذْ قَالَتِ الْمَلَائِكَةُ يَا مَرْيَمُ إِنَّ اللَّهَ اصْطَفَاكِ وَطَهَّرَكِ وَاصْطَفَاكِ عَلَىٰ نِسَاءِ الْعَالَمِينَ ٤٢

وَطَهَّرَكِ waṭahharaki · and purified you

And [mention] when the angels said, "O Mary, indeed Allāh has chosen you and purified you and chosen you above the women of the worlds. (Surah Ali 'Imran, 3:42)

وَبَشِّرِ الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ أَنَّ لَهُمْ جَنَّاتٍ تَجْرِي مِن تَحْتِهَا الْأَنْهَارُ كُلَّمَا رُزِقُوا مِنْهَا مِن ثَمَرَةٍ رِّزْقًا قَالُوا هَٰذَا الَّذِي رُزِقْنَا مِن قَبْلُ وَأُتُوا بِهِ مُتَشَابِهًا وَلَهُمْ فِيهَا أَزْوَاجٌ مُّطَهَّرَةٌ وَهُمْ فِيهَا خَالِدُونَ ٢٥

مُّطَهَّرَةٌ muṭahharatun · purified

And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally. (Surah Al-Baqarah, 2:25)

وَيَسْأَلُونَكَ عَنِ الْمَحِيضِ قُلْ هُوَ أَذًى فَاعْتَزِلُوا النِّسَاءَ فِي الْمَحِيضِ وَلَا تَقْرَبُوهُنَّ حَتَّىٰ يَطْهُرْنَ فَإِذَا تَطَهَّرْنَ فَأْتُوهُنَّ مِنْ حَيْثُ أَمَرَكُمُ اللَّهُ إِنَّ اللَّهَ يُحِبُّ التَّوَّابِينَ وَيُحِبُّ الْمُتَطَهِّرِينَ ٢٢٢

تَطَهَّرْنَ taṭahharna · they are purified

And they ask you about menstruation. Say, "It is harm, so keep away from wives during menstruation. And do not approach them until they are pure. And when they have purified themselves, then come to them from where Allāh has ordained for you. Indeed, Allāh loves those who are constantly repentant and loves those who purify themselves." (Surah Al-Baqarah, 2:222)

وَإِذَا طَلَّقْتُمُ النِّسَاءَ فَبَلَغْنَ أَجَلَهُنَّ فَلَا تَعْضُلُوهُنَّ أَن يَنكِحْنَ أَزْوَاجَهُنَّ إِذَا تَرَاضَوْا بَيْنَهُم بِالْمَعْرُوفِ ذَٰلِكَ يُوعَظُ بِهِ مَن كَانَ مِنكُمْ يُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الْآخِرِ ذَٰلِكُمْ أَزْكَىٰ لَكُمْ وَأَطْهَرُ وَاللَّهُ يَعْلَمُ وَأَنتُمْ لَا تَعْلَمُونَ ٢٣٢

وَأَطْهَرُ wa-aṭharu · and more purer

And when you divorce women and they have fulfilled their term, do not prevent them from remarrying their [former] husbands if they [i.e., all parties] agree among themselves on an acceptable basis. That is instructed to whoever of you believes in Allāh and the Last Day. That is better for you and purer, and Allāh knows and you know not. (Surah Al-Baqarah, 2:232)

وَهُوَ الَّذِي أَرْسَلَ الرِّيَاحَ بُشْرًا بَيْنَ يَدَيْ رَحْمَتِهِ وَأَنزَلْنَا مِنَ السَّمَاءِ مَاءً طَهُورًا ٤٨

طَهُورًا ṭahūran · pure

And it is He who sends the winds as good tidings before His mercy [i.e., rainfall], and We send down from the sky pure water (Surah Al-Furqan, 25:48)