On the authority of Abu Hurairah (radiyallaahu-anhu) who said: ”The Messenger of Allaah (sallal-laahu-alayhi-wasallam) said, ”Part of the perfection of a person’s Islaam is his leaving that which is of no concern to him” (Hassan Hadith. Reported by Imaam Tirmidhi and others)
Imaam Muhammad Ibn Saaleh al Uthaimeen (rahimahullaah) said:
From the benefits of this narration are:
. Indeed, Islaam combines all the excellent qualities. Our Sheikh Abdur Rahmaan Bin Sa’di (rahimahullaah) has written a treatise on this topic (titled): ‘The Excellence of The Religion Of Islaam’. Likewise, Sheikh Abdul Azeez Bin Muhammad Bin Sulaymaan (rahimahullaah) has written a treatise on this topic. And the excellent qualities of Islaam are combined in two statements: Allaah (The Mighty and Majestic) said:
‘’Verily, Allah enjoins Al-Adl (i.e. justice and worshipping none but Allah Alone – Islamic Monotheism) and Al-Ihsan [i.e. to be patient in performing your duties to Allah, totally for Allah’s sake and in accordance with the Sunnah (legal ways) of the Prophet in a perfect manner], and giving (help) to kith and kin (i.e. all that Allah has ordered you to give them e.g., wealth, visiting, looking after them, or any other kind of help, etc.): and forbids Al-Fahsha’ (i.e all evil deeds, e.g. illegal sexual acts, disobedience of parents, polytheism, to tell lies, to give false witness, to kill a life without right, etc.), and Al-Munkar (i.e all that is prohibited by Islamic law: polytheism of every kind, disbelief and every kind of evil deeds, etc.), and Al-Baghy (i.e. all kinds of oppression), He admonishes you, that you may take heed.” [16:90]
 Part of the perfection of (a Person’s) Islaam is his leaving what is of no importance to him, and that which has no relation to his affairs and needs.
 One cannot perfect his Islaam through preoccupying himself with what does not concern him. This happens to many people, so you either find him speaking about affairs that do not concern him, or a person asks him about affairs that do not concern him and he enters into what does not concern him. This leads to weakening of (one’s Islaam).
 Indeed, it is incumbent upon the person to seek after the excellent qualities of Islaam, in order to abandon what does not concern him and be at ease. He will exhaust himself if he busies himself with affairs that are neither important nor of concern to him.
(However) there is an ambiguity on this point here, and that is: Does the slave’s abandonment of that which does not concern him (mean) that he is to abandon Enjoining Good and Forbidding Evil? The Answer: No, because Enjoining Good and Forbidding Evil is something that concerns the person, as Allaah (The Mighty and Majestic) said: ”Let there arise out of you a group of people inviting to all that is good (Islam), enjoining Al-Ma’ruf (i.e. Islamic Monotheism and all that Islam orders one to do) and forbidding Al-Munkar (polytheism and disbelief and all that Islam has forbidden).” [3:104]
So if you see a person upon evil, you should say to him, ”O brother! This is evil. It is not permissible”. The person who witnesses that (evil) has no right to say, “This does not concern me”. It will not be accepted were you to say so, because enjoining good and forbidding evil concerns the entire ummah. And there is (also) that which is connected to one’s the family, his sons and daughters (of enjoining good and forbidding evil). It is the concern of the shepherd of the house to guide them towards good and command them with it, and to warn them against evil and prohibit them from that. He (The Mighty and Majestic) said: “O you who believe! Ward off yourselves and your families against a Fire (Hell) whose fuel is men and stones” [66:6]
Imaam Sa’di (rahimahullaah) said:
The Good Doer busies himself with what concerns him of obligations and abandons disobedience and evil deeds. He (abandons) that which does not befit him of the detested affairs and those permissible things that bring him no benefit, rather he loses goodness by indulging in them. So his (sallal-laahu-alayhi-wasallam) statement: “From the perfection of a person’s Islaam is his leaving that which is of no concern to him” has a more general meaning than what we have mentioned. And the general meaning of this hadith is: The one who does not abandon that which does not concern him will harm his Islaam. That is why all the forbidden statements and actions are either prohibited with the verdict of “Haraam” or with a prohibition (indicating the abhorrence or repugnance of such statements and actions).