Worship is to obey Allah and His Messenger صلى عليه وسلم by doing His Commands and refraining from the prohibitions humbly and submissively for the love of Allah سبحانه وتعالى and His Messenger.

 

وَأَطِيعُوا اللَّهَ وَالرَّسُولَ لَعَلَّكُمْ تُرْحَمُونَ

And obey Allâh and the Messenger (Muhammad صلى الله عليه وسلم) that you may obtain mercy.

Sûrah 3. Al-Imrân, ayah 132.