On the authority of Abu Hurairah (, may Allah be pleased with him), who said: The messenger of Allah prophet Muhammad (peace and blessings of Allah be upon him) said: "There will be seven persons sheltered under the shade of Allah on the day of judgement when there will be no other shade besides his shade. They are: a just ruler: a young man passes his youth in worship and service of Allah - the Lord of honor and glory, one whose heart is perpetually attached to the mosque; two persons who love each other for the sake of Allah, they joined together for his sake and parted for his sake: a man who is invited for sin by a rich beautiful woman but declines, saying I fear Allah. One who gives charity in a secret way without making a show, in a way that his left hand does not know what his right hand spent; and one who remembers Allah in solitude so that his eyes overflow (fill with tear).
(Bukhari and Muslim)
Comments
The means of seven types of people that are considered to be very unique and difficult to find. Those special people will have better treatment on the judgement day. They will not have to wait in the unbearable heat: but rather, will be allowed to wait for their judgement in the comfortable shade.
Two people who love each other for the sake of Allah means people whose friendship is not based on materialistic or superficial things, but on their mutual love for Allah. When one of them become currupted, they are no longer friends.