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:2:21 –

O mankind, worship your Lord, who created you and those before you, that you may become righteous -  

O people, of Mecca, worship, profess the oneness of, your Lord Who created you, made you when you were nothing, and created those that were before you; so that you may be fearful, of His punishment by worshipping Him (la‘alla, ‘so that’, is essentially an optative, but when spoken by God it denotes an affirmative),
القرآن:٢:٢١ –

يَا أَيُّهَا النَّاسُ اعْبُدُوا رَبَّكُمُ الَّذِي خَلَقَكُمْ وَالَّذِينَ مِنْ قَبْلِكُمْ لَعَلَّكُمْ تَتَّقُونَ  

{يا أيُّها الناس} أي أهل مكة {اعبدوا} وحِّدوا {ربَّكم الذي خلقكم} أنشأكم ولم تكونوا شيئاً {و} خلق {الذين من قبلكم لعلكم تتقون} بعبادته عقابَه، ولعل: في الأصل للترجي، وفي كلامه تعالى للتحقيق.