The Statement of Allah the Most High: '... and believes in Al-Ḥusnā." (1)(V.92:6) (1): (Ch.) The best (i.e., either Lā ilāha illallāh: none has the right to be worshipped but Allah) or a reward from Allah (i.e., Allah will compensate him for what he will spend in Allah's way or bless him with Paradise).

Sahih al-Bukhari · Book 65 · Hadith 4945b

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا عَبْدُ الْوَاحِدِ، حَدَّثَنَا الأَعْمَشُ، عَنْ سَعْدِ بْنِ عُبَيْدَةَ، عَنْ أَبِي عَبْدِ الرَّحْمَنِ، عَنْ عَلِيٍّ ـ رضى الله عنه ـ قَالَ كُنَّا قُعُودًا عِنْدَ النَّبِيِّ صلى الله عليه وسلم فَذَكَرَ الْحَدِيثَ‏.‏

Narrated Abu `Abdur-Rahman: `Ali said, "We were sitting with the Prophet," (He then mentioned the Hadith above (469).