Hadithcore
Sahih Muslim, 54 b
sahih

Zuhair b. Harb said:

Jarir reported on the authority of A'mash with this chain of transmitters that the Messenger of Allah (ﷺ) observed: By him in Whose hand is my life, you shall not enter Paradise unless you believe. The rest of the hadith is the same as narrated by Abd Mu'awiya and Waki'.

وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، أَنْبَأَنَا جَرِيرٌ، عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏

‏ وَالَّذِي نَفْسِي بِيَدِهِ لاَ تَدْخُلُونَ الْجَنَّةَ حَتَّى تُؤْمِنُوا ‏

‏ ‏.‏ بِمِثْلِ حَدِيثِ أَبِي مُعَاوِيَةَ وَوَكِيعٍ ‏.‏

References2 variants
In-Book Reference
Book 1, Hadith 102
USC-MSA web (English) reference
Book 1, Hadith 97 (deprecated numbering scheme)