The Quran root ت و ب t-w-b

فَتَلَقَّىٰ آدَمُ مِن رَّبِّهِ كَلِمَاتٍ فَتَابَ عَلَيْهِ إِنَّهُ هُوَ التَّوَّابُ الرَّحِيمُ ٣٧

فَتَابَ fatāba · So (his Lord) turned

Then Adam received from his Lord [some] words, and He accepted his repentance. Indeed, it is He who is the Accepting of Repentance, the Merciful. (Surah Al-Baqarah, 2:37)

وَإِذْ قَالَ مُوسَىٰ لِقَوْمِهِ يَا قَوْمِ إِنَّكُمْ ظَلَمْتُمْ أَنفُسَكُم بِاتِّخَاذِكُمُ الْعِجْلَ فَتُوبُوا إِلَىٰ بَارِئِكُمْ فَاقْتُلُوا أَنفُسَكُمْ ذَٰلِكُمْ خَيْرٌ لَّكُمْ عِندَ بَارِئِكُمْ فَتَابَ عَلَيْكُمْ إِنَّهُ هُوَ التَّوَّابُ الرَّحِيمُ ٥٤

فَتُوبُوا fatūbū · So turn in repentance

And [recall] when Moses said to his people, "O my people, indeed you have wronged yourselves by your taking of the calf [for worship]. So repent to your Creator and kill yourselves [i.e., the guilty among you]. That is best for [all of] you in the sight of your Creator." Then He accepted your repentance; indeed, He is the Accepting of Repentance, the Merciful. (Surah Al-Baqarah, 2:54)

رَبَّنَا وَاجْعَلْنَا مُسْلِمَيْنِ لَكَ وَمِن ذُرِّيَّتِنَا أُمَّةً مُّسْلِمَةً لَّكَ وَأَرِنَا مَنَاسِكَنَا وَتُبْ عَلَيْنَا إِنَّكَ أَنتَ التَّوَّابُ الرَّحِيمُ ١٢٨

التَّوَّابُ l-tawābu · the Oft-returning

Our Lord, and make us Muslims [in submission] to You and from our descendants a Muslim nation [in submission] to You. And show us our rites [of worship] and accept our repentance. Indeed, You are the Accepting of Repentance, the Merciful. (Surah Al-Baqarah, 2:128)

إِنَّ الَّذِينَ كَفَرُوا بَعْدَ إِيمَانِهِمْ ثُمَّ ازْدَادُوا كُفْرًا لَّن تُقْبَلَ تَوْبَتُهُمْ وَأُولَٰئِكَ هُمُ الضَّالُّونَ ٩٠

تَوْبَتُهُمْ tawbatuhum · their repentance

Indeed, those who disbelieve [i.e., reject the message] after their belief and then increase in disbelief - never will their [claimed] repentance be accepted, and they are the ones astray. (Surah Ali 'Imran, 3:90)

كَذَٰلِكَ أَرْسَلْنَاكَ فِي أُمَّةٍ قَدْ خَلَتْ مِن قَبْلِهَا أُمَمٌ لِّتَتْلُوَ عَلَيْهِمُ الَّذِي أَوْحَيْنَا إِلَيْكَ وَهُمْ يَكْفُرُونَ بِالرَّحْمَٰنِ قُلْ هُوَ رَبِّي لَا إِلَٰهَ إِلَّا هُوَ عَلَيْهِ تَوَكَّلْتُ وَإِلَيْهِ مَتَابِ ٣٠

مَتَابِ matābi · (is) my return

Thus have We sent you to a community before which [other] communities have passed on so you might recite to them that which We revealed to you, while they disbelieve in the Most Merciful. Say, "He is my Lord; there is no deity except Him. Upon Him I rely, and to Him is my return." (Surah Ar-Ra'd, 13:30)

التَّائِبُونَ الْعَابِدُونَ الْحَامِدُونَ السَّائِحُونَ الرَّاكِعُونَ السَّاجِدُونَ الْآمِرُونَ بِالْمَعْرُوفِ وَالنَّاهُونَ عَنِ الْمُنكَرِ وَالْحَافِظُونَ لِحُدُودِ اللَّهِ وَبَشِّرِ الْمُؤْمِنِينَ ١١٢

التَّائِبُونَ al-tāibūna · Those who turn in repentance

[Such believers are] the repentant, the worshippers, the praisers [of Allāh], the travelers [for His cause], those who bow and prostrate [in prayer], those who enjoin what is right and forbid what is wrong, and those who observe the limits [set by] Allāh. And give good tidings to the believers. (Surah At-Tawbah, 9:112)