The Messenger of Allah ﷺ said, "Whoever guarantees to me what is between his jaws and what is between his legs, I guarantee him Paradise."
عن رسول الله ﷺ قال: من يضمن ما بين لحييه وما بين رجليه أضمن له الجنة.
Bukhari narrated it in "Riqaq" (6474) from Muhammad bin Abu Bakr Muqaddami, who said, Umar bin Ali narrated to us, from Abu Hazim, from Sahl bin Saad, and he mentioned it.