The Commands of God in Holy Quran and Ahadith[1]
A believer must act upon the Commands (Ahkam) of Allah-azwj. For the deeds to be accepted, one must act in accordance with Sunnah (traditions of the Holy Prophet-saww)
عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ عَنْ أَبِيهِ عَنْ أَبِي إِسْمَاعِيلَ إِبْرَاهِيمَ بْنِ إِسْحَاقَ الْأَزْدِيِّ عَنْ أَبِي عُثْمَانَ الْعَبْدِيِّ عَنْ جَعْفَرٍ عَنْ آبَائِهِ عَنْ أَمِيرِ الْمُؤْمِنِينَ ( عليه السلام ) قَالَ قَالَ رَسُولُ اللَّهِ ( صلى الله عليه وآله ) لَا قَوْلَ إِلَّا بِعَمَلٍ وَ لَا قَوْلَ وَ لَا عَمَلَ إِلَّا بِنِيَّةٍ وَ لَا قَوْلَ وَ لَا عَمَلَ وَ لَا نِيَّةَ إِلَّا بِإِصَابَةِ السُّنَّةِ .
A number of our companions, from Ahmad Bin Muhammad Bin Khalid, from his father, from Abu Ismail Ibrahim Bin Is’haq Al Azdy, from Abu Usman Al Abady, from;
(Imam) Ja’far-asws, from his-asws forefathers-asws, from Amir Al-Momineen-asws having said: ‘Rasool-Allah-saww said: ‘There is no word except with the deed, and there is neither a word nor a deed except with an intention, and there is neither a word nor a deed nor an intention except with attaining the Sunnah’.[2]
[1] https://hubeali.com/the-kiraha-makruh-mustahab-and-sunnah/
[2] Al Kafi V 1 – The Book Of Intellect and Ignorance CH 21 H 9