Sahih Muslim 28
Sahih Muslim · Book 1: The Book of Faith · The evidence that one who dies believing in tawhid will definitely enter paradise
It is narrated on the authority of Umar b. Hani with the same chain of transmitters with the exception of these words:
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 " .
Allah would make him (he who affirms these truths) enter Paradise through one of the eight doors which he would like.