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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:73:8 –

And remember the name of your Lord and devote yourself to Him with ˹complete˺ devotion.  

And mention the Name of your Lord, that is, say, bi’smi’Llāhi’l-rahmāni’l-rahīm, ‘In the Name of God, the Compassionate, the Merciful’, to begin your recitation, and devote yourself ˹exclusively˺ to Him with complete devotion (tabtīlan is the verbal noun from batala, used here ˹instead of tabattulan˺ in order to concord with the end-rhyme of the verses) for he ˹the Prophet˺ is obliged to devote himself to God.
القرآن:٧٣:٨ –

وَاذْكُرِ اسْمَ رَبِّكَ وَتَبَتَّلْ إِلَيْهِ تَبْتِيلًا  

{واذكر اسم ربك} أي قل بسم الله الرحمن الرحيم في ابتداء قراءتك {وتبتل} انقطع {إليه تبتيلا} مصدر بتلَ جيء به رعاية للفواصل وهو ملزوم التبتل.