رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 391
The Book of Miscellany
Making Judgment of people keeping in view their evident actions and leaving their hidden Actions to Allah (swt)
وَعَنْ أَبِي عَبْدِ اللَّهِ طارق بْن أشيم ، رَضِيَ اللَّه عَنْهُ ، قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: مَنْ قَالَ لاَ إِلَهَ إِلاَّ اللَّهُ ، وَكَفَرَ بِمَا يُعْبَدُ مِنْ دُونِ اللَّهِ، حَرُمَ مَالُهُ وَدَمُهُ، وَحِسَابُهُ عَلَى اللَّهِ تَعَالَى ((رَوَاهُ مُسْلِم)).
Abu Abdullah bin Tariq bin Ashyam (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "He who professes La ilaha illallah (There is no true god except Allah), and denies of everything which the people worship besides Allah, his property and blood become inviolable, and it is for Allah to call him to account". [Muslim].
Riyad as-Salihin, 391