Narrated `Utban bin Malik Al-Ansari,
who was one of the men of the tribe of Bani Salim: Allah’s Messenger (ﷺ) came to me and said, “No servant of Allah comes on the Day of Resurrection who has said: La ilaha illal-lah, sincerely, seeking His face (pleasure), except Allah will make the Hell-Fire forbidden for him.”
قَالَ سَمِعْتُ عِتْبَانَ بْنَ مَالِكٍ الأَنْصَارِيَّ، ثُمَّ أَحَدَ بَنِي سَالِمٍ قَالَ غَدَا عَلَىَّ رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ “ لَنْ يُوَافِيَ عَبْدٌ يَوْمَ الْقِيَامَةِ يَقُولُ لاَ إِلَهَ إِلاَّ اللَّهُ. يَبْتَغِي بِهِ وَجْهَ اللَّهِ، إِلاَّ حَرَّمَ اللَّهُ عَلَيْهِ النَّارَ ”.
Reference : Sahih al-Bukhari 6423
In-book reference : Book 81, Hadith 12
USC-MSA web (English) reference : Vol. 8, Book 76, Hadith 431