Sahih Bukhari · Hadith 6895
Punishment of Disbelievers at War with Allah and His Apostle - كتاب المحاربين من أهل الكفر والردة
حدثنا محمد بن أبي بكر، حدثنا عمر بن علي. وحدثني خليفة، حدثنا عمر بن علي، حدثنا أبو حازم، عن سهل بن سعد الساعدي، قال النبي صلى الله عليه وسلم " من توكل لي ما بين رجليه وما بين لحييه، توكلت له بالجنة ".
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."
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).