(11) باب يَدْخُلُ الْجَنَّةَ أَقْوَامٌ أَفْئِدَتُهُمْ مِثْلُ أَفْئِدَةِ الطَّيْرِ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
There would enter Paradise people whose hearts would be like those of the hearts of birds.
Reference: Sahih Muslim 2840
In-book reference: Book 53, Hadith 31
USC-MSA web (English) reference(deprecated numbering scheme): Book 40, Hadith 6808