373 من يضمن لي ما بين لحييه وما بين رجليه أضمن له الجنة
Whoever guarantees for me to safeguard what is between his jaws and what is between his legs, I shall guarantee Paradise for him

عن سهل بن سعد رضي الله عنهما مرفوعاً: «من يضمن لي ما بين لَحْيَيْهِ وما بين رجليه أضمن له الجنة».

Sahl ibn Sa‘d (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Whoever guarantees for me to safeguard what is between his jaws and what is between his legs, I shall guarantee Paradise for him.”

صحيح - ( رواه البخاري ). Sahih/Authentic. [Al-Bukhari]

يرشد النبي صلى الله عليه وسلم إلى أمرين يستطيع المسلم إذا ما التزم بهما أن يدخل الجنة التي وعد الله عباده المتقين، وهذان الأمران هما حفظ اللسان من التكلم بما يغضب الله تعالى ، والأمر الثاني حفظ الفرج من الوقوع في الزنا.
The Prophet (may Allah's peace and blessings be upon him) guides to two things. If the Muslim is able to observe them, he will be guaranteed admission to Paradise that Allah has promised His righteous slaves. These two things are: preventing the tongue from speaking what displeases Allah, the Almighty, and avoiding unlawful sex.

حفظ اللسان والفرج من الوقوع في الحرام سبيل لدخول الجنة. أن أكثر أسباب دخول النار عدم حفظ ما بين الفرج واللسان.
Preserving the tongue and private parts from falling into the unlawful is a means for entering Paradise. One of the most common causes of entering Hellfire is failure to preserve the tongue and private parts.