The Quran itself does not explicitly state that good character is the quality of the people of Jannah, but many verses and Hadith link it directly to entering Paradise. For example, the Quran describes the believers who will succeed in Jannah as those who are “humbly submissive” in their prayer, “turn away from ill speech,” and are “observant of zakah” and “guard their private parts”. The Hadith tradition further clarifies this, with the Prophet Muhammad (peace be upon him) stating that the two things that admit most people into Paradise are “fear of Allah and good character”

حَدَّثَنَا إِسْمَاعِيلُ بْنُ أَبِي أُوَيْسٍ قَالَ‏: ‏ حَدَّثَنِي أَخِي، عَنْ سُلَيْمَانَ بْنِ بِلاَلٍ، عَنْ إِبْرَاهِيمَ بْنِ أَبِي أُسَيْدٍ، عَنْ جَدِّهِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ‏: ‏ وَالَّذِي نَفْسِي بِيَدِهِ، لاَ تَدْخُلُوا الْجَنَّةَ حَتَّى تُسْلِمُوا، وَلاَ تُسْلِمُوا حَتَّى تَحَابُّوا، وَأَفْشُوا السَّلاَمَ تَحَابُّوا، وَإِيَّاكُمْ وَالْبُغْضَةَ، فَإِنَّهَا هِيَ الْحَالِقَةُ، لاَ أَقُولُ لَكُمْ‏: ‏ تَحْلِقُ الشَّعْرَ، وَلَكِنْ تَحْلِقُ الدِّينَ‏.‏

Abu Huraiyra reported that the Prophet, may Allah bless him and grant him peace, said, “By the One in Whose Hand my soul is, you will not enter Paradise until you submit to Islam. And, you will not submit to Islam until you love one another. Extend the greeting to one another and you will love one another. Beware of hatred, for it is the razor. I do not tell you that it shaves the hair, but it shaves away the deen.”

Al-Adab Al-Mufrad