Sahih al-Bukhari, Book 86, Hadith 37 (In-Book) ⓘ

Narrated Sahl bin Sa`d: The Prophet said, "Whoever guarantees me (the chastity of) what is between his legs (i.e. his private parts), and what is between his jaws (i.e., his tongue), I guarantee him Paradise."

حَدَّثَنَا مُحَمَّدُ بْنُ أَبِي بَكْرٍ، حَدَّثَنَا عُمَرُ بْنُ عَلِيٍّ‏.‏ وَحَدَّثَنِي خَلِيفَةُ، حَدَّثَنَا عُمَرُ بْنُ عَلِيٍّ، حَدَّثَنَا أَبُو حَازِمٍ، عَنْ سَهْلِ بْنِ سَعْدٍ السَّاعِدِيِّ، قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ مَنْ تَوَكَّلَ لِي مَا بَيْنَ رِجْلَيْهِ وَمَا بَيْنَ لَحْيَيْهِ، تَوَكَّلْتُ لَهُ بِالْجَنَّةِ ‏" ‏‏.‏