Sahih Muslim 2840
Sahih Muslim · Book 53: The Book of Paradise, its Description, its Bounties and its Inhabitants · People Will Enter Paradise Whose Hearts Are Like The Hearts Of Birds
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
حَدَّثَنَا حَجَّاجُ بْنُ الشَّاعِرِ ، حَدَّثَنَا أَبُو النَّضْرِ، هَاشِمُ بْنُ الْقَاسِمِ اللَّيْثِيُّ حَدَّثَنَا إِبْرَاهِيمُ، - يَعْنِي ابْنَ سَعْدٍ - حَدَّثَنَا أَبِي ، عَنْ أَبِي سَلَمَةَ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " يَدْخُلُ الْجَنَّةَ أَقْوَامٌ أَفْئِدَتُهُمْ مِثْلُ أَفْئِدَةِ الطَّيْرِ " .
There would enter Paradise people whose hearts would be like those of the hearts of birds.