Hadith 3

Riyad as-Salihin

Book 17: The Book of the Prohibited actions

Chapter 254

The Prohibition of Backbiting and the Commandment of Guarding one's Tongue

باب تحريم الغيبة والأمر بحفظ اللسان

Riyad as-Salihin 1513
وعن سهل بن سعد قال‏:‏ قال رسول الله صلى الله عليه وسلم‏:‏ ‏ ‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏
"‏من يضمن لي ما بين لحييه، وما بين رجليه أضمن له الجنة‏"
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].