The Noble Messenger of Allah (s.a.w.) said:
"Never does he believe in me who goes to bed full while his neighbour is hungry. Never shall Allah on the Day of Judgement look with favour at the people of a place who pass their night satisfied but among them is a hungry one."

Also The Holy Quran says:
It is He who has sent to the unlettered people an apostle from among themselves, reciting to them and teaching them the Book and wisdom, although they were before in manifest error. (Qur'an, 62:2)

Imam Ja'far al-Sadiq (a.s.) said:
"The right of the Muslim on the Muslim is that he should never eat his fill while his brother suffers, never should be quench his thirst while his brother suffers thirst, never should he clothe himself while his brother suffers inadequate clothing."

Islamic Supplications