Islam teaches us to have good manners. And part of good manners is, to avoid harming other Muslims. And also, part of good manners, we should avoid haram matters.
The Prophet (ﷺ) said:
المُسْلِمُ مَن سَلِمَ المُسْلِمُونَ مِن لِسانِهِ ويَدِهِ، والمُهاجِرُ مَن هَجَرَ ما نَهَى اللَّهُ عنْه
“A Muslim is the one who avoids harming Muslims with his tongue and hands. And a Muhajir (emigrant) is the one who gives up (abandons) all what Allah has forbidden” [Saheeh al-Bukhari].
He (ﷺ) also said:
الْمُسْلِمُ أَخُو الْمُسْلِمِ لاَ يَظْلِمُهُ وَلاَ يَخْذُلُهُ وَلاَ يَحْقِرُهُ
“A Muslim is the brother of a Muslim. He neither oppresses him nor humiliates him nor looks down upon him” [Saheeh Muslim].
12 gifts in 12 months. You can save lives all year long. Make a monthly gift: ussunnah.org/orphans