The Book of Faith
1/34. Chapter:
Clarifying that faith decreases with shortcoming in obedience, and the word Kufr may be used with regard to matters other than dsbelief in Allah, such as ingratitude for blessings and not fulfilling one's duties
Sahih Muslim
وَحَدَّثَنِيهِ أَبُو الطَّاهِرِ، أَخْبَرَنَا ابْنُ وَهْبٍ، عَنْ بَكْرِ بْنِ مُضَرَ، عَنِ ابْنِ الْهَادِ، بِهَذَا الإِسْنَادِ مِثْلَهُ .
This hadith has been narrated on the authority of Abu Tahir with this chain of transmitters.
Reference : Sahih Muslim 79bIn-book reference : Book 1, Hadith 148USC-MSA web (English) reference : Book 1, Hadith 142