Maintain purity & cleanliness before entering any place of worship; Respect others when inside a mosque or other places of worship; Strive for physical, mental & spiritual cleanliness; Uphold special relationships with others

This hadith emphasizes the importance of maintaining purity and cleanliness when entering a mosque. The Prophet Muhammad specifically mentioned that only he and Ali were allowed to be in a state of ritual impurity while inside the mosque. This teaches us that we should always strive to maintain our physical, mental, and spiritual cleanliness before entering any place of worship. We should also take care to ensure that our actions are respectful towards others when we are inside a mosque or other places of worship. Additionally, this hadith highlights the special relationship between Prophet Muhammad and Ali as they were both allowed to enter while being Junub.