What are the rights of relatives and neighbors, and is merely not harming one's neighbor sufficient to avoid sin, even if one does not greet him, along with clarifying the rights of a Muslim upon a Muslim and a disbeliever, and distinguishing between the obligatory and the recommended among these rights?

To learn about the obligatory (wajib) and recommended (mustahabb) rights of neighbors, kinship ties (silat al-rahim), and the rights of a Muslim, as well as the ruling on initiating and returning greetings of peace (salaam), and the ruling on greeting a non-mahram woman, one can consult relevant fatwas.

Beyond the jurisprudential details of these rights, merely refraining from harming people is a gateway to good deeds and a charity for which a person is rewarded. This is based on what was narrated by Bukhari and Muslim from Abu Dharr (may Allah be pleased with him) that the Prophet (peace be upon him) said: "You refrain from evil towards people, for it is a charity you bestow upon yourself." This means that whoever cannot do good, should at least refrain from doing evil, thereby performing a charity for himself by keeping himself away from punishment.