Chapter 2: Surat Al-Baqarah (The Cow), verse 83

Translation:
When we made a covenant with the Children of Israel We said: 'Serve none but God. Show kindness to your parents, to your kinsfolk, to the orphans, and to the destitute. Exhort men to righteousness. Attend to your prayers and pay the poor-due.' But you all turned your backs except a few, and gave no heed.
Tafsir
(Commentary):
Man’s
first duty to God is to serve Him. In so doing he should ascribe no partners to
Him. Secondly, he should show kindness to others. Kindness starts at home, with
one’s parents and family, extends to one’s neighbours and relatives, and
finally reaches out to everyone with whom one comes into contact. There is only
one proper way to deal with others, and that is with justice and benevolence.
Where
one is really tested in one’s dealings is with “orphans and the
destitute,” that is, with the weaker members of society. As for the strong,
their strength itself guarantees that they will be given deferential treatment.
It is to the weak, therefore, that one should be especially careful to show
kindness. People who are kind to those who wield no worldly power and possess
scant resources do so for God’s sake alone, for there is no other incentive at
work.