Follow proper etiquette during prayer; Remain respectful; Remain humble; Follow instructions given by Imam; Be mindful of Allah's presence at all times; Strive not to sin against Him.

This hadith from Abu Hurairah warns us of the importance of following proper etiquette during prayer. The Prophet Muhammad ﷺ is reminding us that we should not raise our heads while the Imam is prostrating, as Allah may change our head or face into a donkey's if we do so. We must remember to be respectful and humble in prayer, and to follow the instructions of the Imam carefully. It is important to remember that Allah sees all and knows all, so it is essential that we remain mindful of His presence at all times.

This hadith also teaches us about fear - specifically fear of Allah - which can help keep us on track when it comes to following His commands and avoiding sinning against Him. We must always strive to be mindful of His greatness and power, so that we can stay away from any actions which would displease Him.