The Prophet ﷺ said, "Whoever guarantees for me what is between his jaws and what is between his legs, I will guarantee him Paradise."
حدثنا عفان حدثنا عمر بن علي قال سمعت أبا حازم
عن النبي ﷺ قال من توكل لي ما بين لحييه وما بين رجليه توكلت له بالجنة
Its isnad is sahih. Umar bin Ali is Ibn Ata Muqaddami, and he is trustworthy, his hadith being accepted by the entire community. The hadith was narrated by Bukhari, 12/113, no. 6807, Fath, and Tirmidhi, 4/606, no. 2408, who said, "Hasan sahih gharib." Also Malik, 2/987, no. 11, in speech. Hakim graded it sahih, 4/358, and Dhahabi agreed with him, saying, "It is found in Bukhari."