Walls are a way to distinguish those from inside the community from those who are outside of a community. The Walls happens to also be the title of Sura 49, where many of the rules for how members of a believing community are to treat one another, resolve differences, and even self identify.
Starting from verse 13, we see that as a community we can come from different cultures, customs, or tribes, but what ties us all together is our righteousness. This happens to also be the sole criteria that God uses to judge between the people. That it doesn’t matter if a person is male or female, rich or poor, tall or short, but the only thing that matters in the sight of God is their righteousness.
49:13 O people, we created you from the same male and female, and rendered you distinct peoples and tribes, that you may recognize one another. The best among you in the sight of GOD is the most righteous. GOD is Omniscient, Cognizant.
Righteousness has two components; belief and action. If someone believes appropriately, but their actions do not correspond with good works then they are behaving as a hypocrite.
61:3 Most abominable in the sight of GOD is that you say what you do not do.
While it is typically easier to assess a person’s actions, we cannot always determine someone’s belief. This does not only go for others, but even for ourselves as seen in the example of some of the hypocrites in the Quran.
2:11 When they are told, “Do not commit evil,” they say, “But we are righteous!” 2:12 In fact, they are evildoers, but they do not perceive.
35:8 Note the one whose evil work is adorned in his eyes, until he thinks that it is righteous. GOD thus sends astray whoever wills (to go astray), and He guides whoever wills (to be guided). Therefore, do not grieve over them. GOD is fully aware of everything they do.
40:56 Surely, those who argue against GOD’s revelations without proof are exposing the arrogance that is hidden inside their chests, and they are not even aware of it. Therefore, seek refuge in GOD; He is the Hearer, the Seer.
I believe this is the crucial reason why in the following verse God tells the believers that we should self identify as submitters (Muslims) rather than believers (Mu’mens).
49:14 The Arabs said, “We are Mu’mens (believers).” Say, “You have not believed; what you should say is, ‘We are Muslims (submitters),’ until belief is established in your hearts.” If you obey GOD and His messenger, He will not put any of your works to waste. GOD is Forgiver, Most Merciful.
While submitting is an action that a third party can bear witness to, being a believer is not something that can necessarily be witnessed by others in a community let alone even by the person themselves. This again shows that in a community setting the metric by which we judge each other should be predominately determined by the person’s actions rather than their claimed belief.
49:15 Mu’mens (believers) are those who believe in GOD and His messenger, then attain the status of having no doubt whatsoever, and strive with their money and their lives in the cause of GOD. These are the truthful ones.
In the Quran, God acknowledges that in a believing community there are going to be hypocrites. Despite this God advocates not to divide over these individuals.
4:88 Why should you divide yourselves into two groups regarding hypocrites (among you)? GOD is the one who condemned them because of their own behavior. Do you want to guide those who are sent astray by GOD? Whomever GOD sends astray, you can never find a way to guide them.
God goes further and lets the believers know that we can even befriend hypocrites if they mobilize along with the believers in the cause of God.
4:89 They wish that you disbelieve as they have disbelieved, then you become equal. Do not consider them friends, unless they mobilize along with you in the cause of GOD. If they turn against you, you shall fight them, and you may kill them when you encounter them in war. You shall not accept them as friends, or allies.
This again confirms that in a community what matters after the baseline of belief is met, is the actions and behavior of the individuals to determine if the actions correspond with what one would expect from a submitter.
25:63 The worshipers of the Most Gracious are those who tread the earth gently, and when the ignorant speak to them, they only utter peace.