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كتاب التوحيد
97  
Oneness, Uniqueness of Allah (Tawheed)
(54)
Chapter: “And We have indeed made the Qur'an easy to understand and remember….’
(54)
Sahih al-Bukhari 7551

Narrated `Imran:

I said, "O Allah's Messenger (ﷺ)! Why should a doer (people) try to do good deeds?' The Prophet (ﷺ) said, "Everybody will find easy to do such deeds as will lead him to his destined place for which he has been created.'

حَدَّثَنَا أَبُو مَعْمَرٍ، حَدَّثَنَا عَبْدُ الْوَارِثِ، قَالَ يَزِيدُ حَدَّثَنِي مُطَرِّفُ بْنُ عَبْدِ اللَّهِ، عَنْ عِمْرَانَ، قَالَ قُلْتُ يَا رَسُولَ اللَّهِ فِيمَا يَعْمَلُ الْعَامِلُونَ قَالَ ‏ "‏ كُلٌّ مُيَسَّرٌ لِمَا خُلِقَ لَهُ ‏"‏‏.‏
Reference : Sahih al-Bukhari 7551
In-book reference : Book 97, Hadith 176
USC-MSA web (English) reference : Vol. 9, Book 93, Hadith 641
  (deprecated numbering scheme)