حَدَّثَنَا سَعِيدُ بْنُ مَنْصُورٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، حَدَّثَنِي أَبُو هَانِئٍ الْخَوْلاَنِيُّ، عَنْ أَبِي عَبْدِ الرَّحْمَنِ الْحُبُلِيِّ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ يَا أَبَا سَعِيدٍ مَنْ رَضِيَ بِاللَّهِ رَبًّا وَبِالإِسْلاَمِ دِينًا وَبِمُحَمَّدٍ نَبِيًّا وَجَبَتْ لَهُ الْجَنَّةُ ‏"‏ ‏.‏ فَعَجِبَ لَهَا أَبُو سَعِيدٍ فَقَالَ أَعِدْهَا عَلَىَّ يَا رَسُولَ اللَّهِ فَفَعَلَ ثُمَّ قَالَ ‏"‏ وَأُخْرَى يُرْفَعُ بِهَا الْعَبْدُ مِائَةَ دَرَجَةٍ فِي الْجَنَّةِ مَا بَيْنَ كُلِّ دَرَجَتَيْنِ كَمَا بَيْنَ السَّمَاءِ وَالأَرْضِ ‏"‏ ‏.‏ قَالَ وَمَا هِيَ يَا رَسُولَ اللَّهِ قَالَ ‏"‏ الْجِهَادُ فِي سَبِيلِ اللَّهِ الْجِهَادُ فِي سَبِيلِ اللَّهِ ‏"‏ ‏.‏

It has been narrated on the authority of Abu Sa`id al-Khudri that the Messenger of Allah (PBUH) said (to him): Abu Sa`id, whoever cheerfully accepts Allah as his Lord, Islam as his religion and Muhammad as his Apostle is necessarily entitled to enter Paradise. He (Abu Sa`id) wondered at it and said: Messenger of Allah, repeat it for me. He (the Messenger of Allah) did that and said: There is another act which elevates the position of a man in Paradise to a grade one hundred (higher), and the elevation between one grade and the other is equal to the height of the heaven from the earth. He (Abu Sa`id) said: What is that act? He replied: Jihad in the way of Allah! Jihad in the way of Allah! Translation Not Available

Book Ref: Sahih Muslim Book 33 Hadith 4645
Web Ref:  Sahih Muslim Book 20 Hadith 1884