Riyad as-Salihin 1513
Sahl bin Sa'd (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "Whosoever gives me a guarantee to safeguard what is between his jaws and what is between his legs, I shall guarantee him Jannah." [Al-Bukhari] .
وعن سهل بن سعد قال‏:‏ قال رسول الله صلى الله عليه وسلم‏:‏ ‏
"‏من يضمن لي ما بين لحييه، وما بين رجليه أضمن له الجنة‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏