Surah At-Taubah, Ayat 111

Ayat 111. Verily, Allah has purchased of the believers their lives and their properties; for the price that theirs shall be the Paradise. They fight in Allah's Cause, so they kill (others) and are killed. It is a promise in truth which is binding on Him in the Taurat (Torah) and the Injeel (Gospel) and the Qur'an. And who is truer to his covenant than Allah? Then rejoice in the bargain which you have concluded. That is the supreme success.

Hazrat Abdullah bin Mas`ud (May Allah be pleased with him) reported: The Messenger of Allah  [SAWW](PBUH) said, "I know of the last of the inhabitants of the Hell to be taken out from there and the last one to enter Jannah. He is a man who will come out of the Fire, crawling on all fours. Allah, the Rubb of glory and honour will say to him: `Go and enter Jannah.' He will go to it and think that it is full up. He will then come back and say: `O my Rubb, it is full up.' Allah will say to him: `Go and enter Jannah.' He will again go to it and think that it is full up. So he will turn back. Allah will again say: `Go and enter Jannah. For you have what is equal to ten times the world.' He will say: `Are You making fun of me while You are the King?'' At this I (i.e., the narrator) saw the Messenger of Allah (PBUH) laugh till his premolars were visible and he said, "Such man will be the last dweller of Jannah in its lowest rank.'' [Al-Bukhari Hadith # 6571 and Muslim Hadith # 359].

Lesson : as mentioned above in Surah At-Taubah Ayat 111."And who is truer to his covenant than Allah? Then rejoice in the bargain which you have concluded. That is the supreme success". The general habit of the Prophet (PBUH) was just to smile. But while telling about the gifts and honours about an ordinary person in Jannah, he could not help laughing in a manner that his molars became visible. The person on the lowest pedestal in Jannah will be given ten times better things and gifts that could he had on this earth. May Allah admit us into Jannah in His Mercy. Amin.