10 - It was narrated from ‘Abdullah ibn ‘Amr (may Allah be pleased with him) that the Prophet (blessings and peace of Allah be upon him) said: “The Muslim is the one from whose tongue and hand the Muslims are safe, and the [true] muhajir is the one who shuns (hajara) that which Allah has forbidden.”.

Commentary : This hadith is an example of the concise speech of the Prophet (blessings and peace of Allah be upon him). In it, the Prophet (blessings and peace of Allah be upon him) teaches us to acquire Islamic manners and attitudes, which increase love and harmony among the Muslims. What it means is that the perfect Muslim who attains all the good characteristics that Islam promotes is the one who does not harm any other Muslim in word or deed. The tongue and hand are mentioned in particular, because of the many mistakes they commit and the great deal of harm that they cause, because most ills result from these two things. The tongue tells lies, backbites, reviles and bears false witness, and the hand strikes, kills, steals and so on. The tongue is mentioned first, because causing harm and offence with the tongue is more frequent and easier, and it is more hurtful; it affects both the living and the dead. The Prophet (blessings and peace of Allah be upon him) explained that the one who may be called a muhajir (lit. migrant) in a perfect sense is the one who shuns (hajara) that which Allah has forbidden. So the muhajir who is truly deserving of praise is the one who combines leaving his homeland and people with shunning that which Allah (may He be exalted) has forbidden. Simply migrating from the land of shirk whilst persisting in sin is not hijrah (migration) in a complete and perfect sense. The muhajir in the true sense is the one who does not stop at physical migration, leaving a land of war for a land of safety; rather he is the one who shuns (hajara) everything that Allah has forbidden.
This hadith urges us to refrain from harming any Muslims in any way.
It also teaches us that what a person appears outwardly to be is not something that Allah cares about, unless it is supported by righteous deeds that confirm the soundness of the outward appearance..