Enjoining what is right and forbidding what is wrong is one of the most prominent characteristics of this ummah and is one of the causes of its being superior to others. Allah destroyed some of the nations who came before us because they failed to enjoin what is right and forbid what is wrong. Therefore every Muslim is commanded to enjoin what is right as much as he can, and forbid what is wrong as much as he can. Because ‘Umar ibn al-Khattab (may Allah be pleased with him) was one of the most assiduous in promoting the truth, he never failed to enjoin what is right, wherever he was. In this hadith, ‘Abdullah ibn ‘Umar (may Allah be pleased with him) narrates that during his caliphate, his father ‘Umar (may Allah be pleased with him) was standing and delivering the khutbah one Friday when a man who was one of the earliest Muhajirin, came in. He was ‘Uthman ibn ‘Affan, according to a report in al-Muwatta’. When ‘Umar (may Allah be pleased with him) saw that he had come late, he said to him: “What time is this?” –rebuking him for coming late. ‘Uthman (may Allah be pleased with him) responded by telling him that he had become busy with some matters, so he could not go back to his house until he heard the adhan, so he did wudu’ quickly and did not do ghusl, in order to catch up with Jumu‘ah. ‘Umar (may Allah be pleased with him) said to him: And just wudu’ too, when you know that the Messenger of Allah (blessings and peace of Allah be upon him) used to enjoin us to do ghusl?Here ‘Umar (may Allah be pleased with him) rebuked ‘Uthman (may Allah be pleased with him) a second time. What he meant was: and you did not do ghusl for Jumu‘ah either; you only did wudu? Is it not enough that you came late and missed out on the virtue of coming early, and you followed that with failing to do ghusl, being content with doing wudu’ only, when you heard the Prophet (blessings and peace of Allah be upon him) enjoining us to do ghusl on Friday! The command to do ghusl on Friday is part of the etiquette of coming to the mosque and prayers in congregation. It is advice from the Prophet (blessings and peace of Allah be upon him) to do what is most appropriate and best on such occasions. This hadith indicates that we should enjoin what is right and forbid what is wrong, even if that is in front of other people. It indicates that the leader should check on those under his authority, and instruct them to do that which is best for their spiritual well-being, and to rebuke the one who falls short in doing what is more appropriate. It also indicates that enjoining what is right and forbidding what is wrong may be done during the khutbah and does not invalidate it. It indicates that the Muslim is encouraged to come early to Jumu‘ah. It indicates that it is permissible to just do wudu’ for Jumu‘ah, but highlights the fact that ghusl is better..