´Abu Dharr narrated that the Messenger of Allah (s.a.w) said:` " I know the last of the people of the Fire to depart from the Fire and the last of the people of Paradise to enter Paradise. A man will be brought forth and He (s.a.w) will say: 'Ask about his small sins and hide his large sins.' So it will be said to him: 'Did you do this and that on such and such a day, did you do this and that on such- and – such a day?'” He said: “Then it will be said to him; 'For each of your sins you shall have a reward.'” He (s.a.w) said: “So he will say: 'O Lord! I have done things that I do not see here.'” He (Abu Dharr) said: “I saw the Messenger of Allah (s.a.w) laugh until his molars were visible.” (Sahih)
Hadith Referenceسنن ترمذي / كتاب صفة جهنم عن رسول الله صلى الله عليه وسلم / 2596
It is reporter on the authority of Abu Hurairah (RA) that the Messenger of Allah (ﷺ) (may peace and blessings be upon him) observed: There came the people of Yemen who are soft of hearts, tender in feelings: the belief is that of the Yemenites, the sagacity is that of the Yemenites and the summit of unbelief is towards the East.
Shaykh Maulana Abdul Aziz Alvi
Hadith Commentary: Vocabulary of the Hadith:
رَأْسُالْكُفْرِ (Ra’s al-Kufr): "Ra’s" refers to the head, the secret, or the peak of something. And "Ra’s al-Shahr" means the first day of the month. Therefore, the intended meaning here is the source or origin. Just as in the saying: "Ra’s al-Hikmah Makhāfatullāh" — "The source of wisdom is the fear of Allah."
Source: Tuhfat al-Muslim: Commentary on Sahih Muslim, Page: 190