«إِنَّ اللَّهَ لَيَعْجَبُ مِنَ الْشَّابِّ لَيْسَتْ لَهُ صَبْوَة.»
"Surely Allah is amazed with the young person who does not have Sabwah (childish folly)." — The Prophet ﷺ

"Within a man there may be ten traits: nine that are good, and one that is bad—and that single bad trait corrupts the rest. Beware of the misstep of youth."
"Indeed, youth, leisure, and wealth are among the greatest sources of corruption for a person." — Al-Munāwī
Luqmān the Wise advised his son: "And do not turn your cheek in arrogance to the people or walk through the earth exultantly. Indeed, Allah does not like everyone who is self-deluded and boastful. And be moderate in your pace and lower your voice; indeed, the most disagreeable of sounds is the voice of donkeys." — Qurʾān 31:18–19
Al-Shāfiʿī said: "Al-Futuwwah is the moral adornment of the free."
«الحَسَنُ وَالحُسَيْنُ سَيِّدَا شَبَابِ أهْلِ الجَنَّةِ.»
"Al-Ḥasan and al-Ḥusayn are the two masters of the youth of Paradise." — The Prophet ﷺ
Abū ʿAbd Allāh al-Sijzī: "The perfection of futuwwah is that creation does not distract you from Allah."
"The true youth is not the one who endures the lash of the whip, but the one who crosses the Bridge (al-Ṣirāṭ) in safety. And the true youth is not the one who bears being stabbed by the knife, but the one who feeds the poor."

"Typically, they add certain practices to the concept of futuwwah that are actually forbidden. Therefore, they must be prohibited from these actions and instructed to uphold what Allah and His Messenger have commanded." — Ibn Taymiyyah
The Prophet ﷺ then placed his hand on him and said: "O Allah, forgive his sin, purify his heart, and protect his chastity." After that, the young man never inclined toward such matters again.
Shaykh Ibn Bāz: "Once he sincerely abandons the sin, feels remorse, and is determined not to return, Allah will accept his repentance — even from disbelief."
"Avoid these filthy acts that Allah has forbidden. Whoever commits any of them must cover themselves with Allah's covering and repent to Allah." — The Prophet ﷺ
"The one who commits a sin keeps it ever before his eyes — whenever he remembers it, it leads him to repentance, seeking forgiveness, and remorse, which ultimately becomes the cause of his salvation. On the other hand, the one who performs a good deed keeps it ever before his eyes — whenever he remembers it, it leads him to self-admiration, arrogance, and a sense of entitlement, which ultimately becomes the cause of his ruin." — Ibn al-Qayyim