It was narrated from Abu Hurairah that the Messenger of Allah ﷺ said:
“O Abu Hurairah, be cautious, and you will be the most devoted of people to Allah. Be content, and you will be the most grateful of people to Allah. Love for people what you love for yourself, and you will be a (true) believer. Be a good neighbor to your neighbors, and you will be a (true) Muslim. And laugh little, for laughing a lot deadens the heart.”

حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنْ أَبِي رَجَاءٍ، عَنْ بُرْدِ بْنِ سِنَانٍ، عَنْ مَكْحُولٍ، عَنْ وَاثِلَةَ بْنِ الأَسْقَعِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ ﷺ ـ " يَا أَبَا هُرَيْرَةَ كُنْ وَرِعًا تَكُنْ أَعْبَدَ النَّاسِ وَكُنْ قَنِعًا تَكُنْ أَشْكَرَ النَّاسِ وَأَحِبَّ لِلنَّاسِ مَا تُحِبُّ لِنَفْسِكَ تَكُنْ مُؤْمِنًا وَأَحَسِنْ جِوَارَ مَنْ جَاوَرَكَ تَكُنْ مُسْلِمًا وَأَقِلَّ الضَّحِكَ فَإِنَّ كَثْرَةَ الضَّحِكِ تُمِيتُ الْقَلْبَ " .