Hadithcore
Sahih Muslim, 28 b
sahih

It is narrated on the authority of Umar b. Hani with the same chain of transmitters with the exception of these words:

Allah would make him (he who affirms these truths) enter Paradise through one of the eight doors which he would like.

وَحَدَّثَنِي أَحْمَدُ بْنُ إِبْرَاهِيمَ الدَّوْرَقِيُّ، حَدَّثَنَا مُبَشِّرُ بْنُ إِسْمَاعِيلَ، عَنِ الأَوْزَاعِيِّ، عَنْ عُمَيْرِ بْنِ هَانِئٍ، فِي هَذَا الإِسْنَادِ بِمِثْلِهِ غَيْرَ أَنَّهُ قَالَ ‏"‏ أَدْخَلَهُ اللَّهُ الْجَنَّةَ عَلَى مَا كَانَ مِنْ عَمَلٍ ‏"‏ ‏.‏ وَلَمْ يَذْكُرْ ‏"‏ مِنْ أَىِّ أَبْوَابِ الْجَنَّةِ الثَّمَانِيَةِ شَاءَ ‏"‏ ‏.‏

References2 variants
In-Book Reference
Book 1, Hadith 48
USC-MSA web (English) reference
Book 1, Hadith 44 (deprecated numbering scheme)