A2noun
تَوْبَةٌ
tawbah
repentance
Example
وَتُوبُوا إِلَى اللَّهِ جَمِيعًا أَيُّهَ الْمُؤْمِنُونَ لَعَلَّكُمْ تُفْلِحُونَ
wa-tūbū ilā Allāhi jamīʿan ayyuha al-muʾminūna laʿallakum tufliḥūn
And turn to Allah in repentance, all of you, O believers, that you might succeed (24:31)
Grammar
Feminine verbal noun (maṣdar) of تَابَ. The root ت-و-ب means 'to return/turn back.' God is التَّوَّابُ (The Oft-Returning, The Acceptor of Repentance).
Culture
Tawbah in Islam is always accepted if sincere. There is an entire surah named At-Tawbah (9). The door of repentance remains open until one's final moments.