Hadithcore
Riyad as-Salihin, 626

Abu Hurairah (May Allah be pleased with him) reported:

Messenger of Allah (ﷺ) was asked about the deed which will be foremost to lead a man to Jannah. He replied, "Fear of Allah and the good conduct." Then he was asked about indulgence which will admit a man to Hell (Fire) and he answered, "The tongue and the genitals." <b>[At- Tirmidhi, who classified it as Hadith Hasan Sahih]</b>.

وعن أبى هريرة رضي الله عنه قال‏:‏ سئل رسول الله صلى الله عليه وسلم عن أكثر ما يدخل الناس الجنة‏؟‏ قال‏:‏ “تقوى الله وحسن الخلق” وسئل عن أكثر ما يدخل الناس النار، قال‏:‏ “الفم والفرج”‏.‏ ‏(‏‏(‏رواه الترمذي وقال‏:‏ حديث حسن صحيح‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 626
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) It urges us to be pious; and piety is a universal term that comprises doing everything that Allah commanded and refraining from everything that He prohibited.<br> 2) Good manners, along with piety, are the key to entering Paradise.