Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
nasai-kubra:10877ʿUbayd b. Ādam b. Abū Iyās from my father > Shaybān > Qatādah > Anas

[Machine] The companions of the Prophet mentioned Malik ibn al-Dukhshum in front of the Messenger of Allah and they talked bad about him. So the Messenger of Allah said, "Leave my companions alone." They said, "O Messenger of Allah, he is the refuge and hiding place of the hypocrites, to whom they go." So the Messenger of Allah said, "Does he not testify that there is no god but Allah and that I am the Messenger of Allah?" They said, "Yes, but there is no good in his testimony." So the Messenger of Allah said, "No servant testifies sincerely from his heart and then dies on that except that Allah will make Paradise forbidden for him."  

الكبرى للنسائي:١٠٨٧٧أَخْبَرَنَا عُبَيْدُ بْنُ آدَمَ بْنِ أَبِي إِيَاسٍ قَالَ حَدَّثَنَا أَبِي قَالَ حَدَّثَنَا شَيْبَانُ عَنْ قَتَادَةَ عَنْ أَنَسٍ قَالَ

ذَكَرَ أَصْحَابُ النَّبِيِّ ﷺ مَالِكَ بْنَ الدُّخْشُمِ عِنْدَ رَسُولِ اللهِ ﷺ فَوَقَعُوا فِيهِ وَشَتَمُوهُ فَقَالَ رَسُولُ اللهِ ﷺ «دَعُوا لِي أَصْحَابِي» فَقَالُوا يَا رَسُولَ اللهِ إِنَّهُ كَهْفُ الْمُنَافِقِينَ وَمَلْجَؤُهُمُ الَّذِي يَلْجَؤُونَ إِلَيْهِ فَقَالَ رَسُولُ اللهِ ﷺ «أَلَيْسَ يَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ وَأَنِّي رَسُولُ اللهِ؟» قَالُوا بَلَى وَلَا خَيْرَ فِي شَهَادَتِهِ فَقَالَ رَسُولُ اللهِ ﷺ «لَا يَشْهَدُ بِهَا عَبْدٌ صَادِقًا مِنْ قَلْبِهِ ثُمَّ يَمُوتُ عَلَى ذَلِكَ إِلَّا حَرَّمَهُ اللهُ عَلَى النَّارِ»