Allah has created jinn and humans to worship Him, as He (Glorified be He) says: And I (Allâh) created not the jinn and mankind except that they should worship Me (Alone). And He says: And your Lord has decreed that you worship none but Him. And that you be dutiful to your parents. He (Glorified be He) also says: Worship Allâh and join none with Him (in worship); and do good to parents
Furthermore, it is related on the authority of Mu'adh ibn Jabal (may Allah be pleased with him) that he (peace be upon him) said, "I was riding behind the Prophet (peace be upon him) on a donkey called 'Ufair when he (peace be upon him) said, ' O Mu' adh! Do you know what is the Right of Allah over His servants and what is the right of the servants over Allah?' I said, ' Allah and His Messenger know best." He (peace be upon him) said, 'Verily, the Right of Allah over His servants is that they should worship Him, associating nothing with Him. And the right of the servants over Allah is not to punish those who associate nothing with Him." I said, ' O Messenger of Allah! Should I give this glad tiding to the people?" He (peace be upon him) said, 'Do not give them the glad tiding, lest they should rely upon it (alone without good deeds).'" (Related by AlBukhari and Muslim)
Muslim scholars (may Allah be merciful to them) have given close definitions to the word 'Ibadah (worship). The most comprehensive definition is that stated by Shaykh AlIslam, Ibn Taymiyyah (may Allah be merciful to him) who says: "It is a comprehensive word comprising all deeds and words that Allah loves and is pleased with whether manifested or hidden." This means that 'Ibadah entails two things: total submission to Allah (Exalted be He) in all His Orders and Prohibitions in a Muslim's beliefs, words and deeds; and living according to the Shari'ah laid down by Allah. A Muslim should treat as lawful that which Allah has declared to be lawful and to treat as forbidden that which Allah has declared to be forbidden. They should submit in all their manners, actions and behaviors to Shari'ah resisting all personal desires and whims. This is applied both to individuals and societies and to both men and women. Anyone who submits to Allah in some aspects of their life and to creatures in other aspects is not a true worshipper of Allah.
But no, by your Lord, they can have no Faith, until they make you (O Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴﻪ ﻭﺳﻠﻢ) judge in all disputes between them, and find in themselves no resistance against your decisions, and accept (them) with full submission.
Do they then seek the judgement of (the days of) Ignorance? And who is better in judgement than Allâh for a people who have firm Faith.