ibn Ma'dān, from Abū Hurayrah, who said: The Messenger of Allah, may Allah bless him and grant him peace, said:

“Islam has landmarks and signposts like those marking a road. These include worshipping Allah without associating anything with Him, establishing prayer, paying zakat, fasting Ramadan, enjoining what is right, forbidding what is wrong, and greeting the children of Adam when you meet them. If they return your greeting, the angels return greetings to both you and them. If they do not return your greeting, the angels return your greeting and curse them if he remains silent toward them. They also include greeting your household when you enter upon them. Whoever neglects any of these has abandoned a share of Islam, and whoever abandons them has cast Islam behind his back.”

Allah Most High has said:

“O you who believe, enter into Islam completely.”

Mujāhid and Qatādah said: “This was revealed concerning the Muslims, commanding them to embrace all the ordinances of Islam.” This does not contradict the view that it was revealed concerning those among the People of the Book who had embraced Islam, or those who had not, for all these people are likewise commanded to do so. The majority explain “into al-silm” as “into Islam,” while another group explain it as obedience. Both explanations are transmitted from Ibn 'Abbās, and both are true, for Islam is obedience, as explained above: it belongs to the category of deeds.

As for His word “completely,” some have said that it means: “Enter, all of you.” Others have said that it means: “Enter into Islam in its entirety.” This is the correct interpretation, for a person is not commanded to perform someone else’s deeds, but only what lies within his own ability. His command “Enter” addresses them all. If “completely” meant “together,” it would follow that a person must refrain from embracing Islam until someone else does so. Embracing Islam would then be commanded only on condition that others join him, as with the Friday prayer. No Muslim says this. If, on the other hand, “completely” means “Enter, all of you,” then all the Quran’s commands, such as His words, “Believe in Allah and His Messenger” and “And establish prayer