The Quran

وَالَّذينَ تَبَوَّءُوا الدّارَ وَالإيمانَ مِن قَبلِهِم يُحِبّونَ مَن هاجَرَ إِلَيهِم وَلا يَجِدونَ في صُدورِهِم حاجَةً مِمّا أوتوا وَيُؤثِرونَ عَلىٰ أَنفُسِهِم وَلَو كانَ بِهِم خَصاصَةٌ ۚ وَمَن يوقَ شُحَّ نَفسِهِ فَأُولٰئِكَ هُمُ المُفلِحونَ

Muhammad Asad

And [it shall be offered, too, unto the poor from among] those who, before them,¹ had their abode in this realm and in faith - [those] who love all that come to them in search of refuge, and who harbour in their hearts no grudge for whatever the others may have been given, but rather give them preference over themselves, even though poverty be their own lot:² for, such as from their own covetousness are saved - it is they, they that shall attain to a happy state!³

I.e., before the coming to them of "those who have forsaken the domain of evil" (see next note).
This relates, in the first instance, to the historical ansar ("helpers") of Medina, who had embraced Islam before the Prophet's and his Meccan followers' coming to them, and who received the refugees with utmost generosity, sharing with them like brethren their own dwellings and all their possessions. In a wider sense, the above refers also to all true believers, at all times, who live in freedom and security within the realm of Islam, and are prepared to receive with open arms anyone who is compelled to leave his homeland in order to be able to live in accordance with the dictates of his faith.
Thus, greed, niggardliness and covetousness are pointed out here as the main obstacles to man's attaining to a happy state in this world and in the hereafter (cf. surah 102).