Narrated Abdullah ibn Umar: The Messenger of Allah ﷺ used to recite the Qur'an to us. When he came upon the verse containing prostration, he would utter the takbir (Allah is most great) and we would prostrate ourselves along with him. The narrator 'Abd al-Razzaq said: Al-Thawri liked this tradition very much. Abu Dawud said: This was liked by him for this contains the uttering of takbir.
The act of prostrating oneself before Allah is an act of humility and submission which shows our devotion towards Him as well as our willingness to obey His commands without hesitation or doubt. It also serves as a reminder for us that we are nothing compared to Him and that He alone should be worshipped above all else. Furthermore, this hadith teaches us about unity within Islam; when we all come together under one leader who follows Allah's commands without question or hesitation then we can become stronger together than apart.