“Love for the people what you love for yourself and you will be a believer.” [Sunan Ibn Mâjah]
If one is greedy and doesn't wish the best for others does that mean you are a disbeliever despite being a Muslim at the same time?
Because you know how if a person is stealing despite being Muslim that makes him following the non Muslim and non God fearing humans out there?
Does that mean if you are greedy it is a form of disbelief?
The hadith you are talking about was narrated in both Bukhari and Muslim as follows:
لايؤمن أحدكم حتى يحب لأخيه ما يحب لنفسه
None of you [truly] believes until he loves for his brother what he loves for himself.
It doesn't mean that you will become a disbeliever if you don't love for your brother what you love for yourself, rather it means that your Imaan is not going to be complete if you don't have that quality.
Another narration of this Hadith in Musnad Al-Imam Ahmed:
لا يبلغ العبد حقيقة الإيمان حتى يحب للناس ما يحب لنفسه
The servant does not reach the reality of [or true] faith until he loves for the people what he loves for himself
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Allah knows best!
