“He is not a believer who goes to sleep with a full stomach while knowing that his next door neighbour is hungry.” (Tabarani and Bazzar).
“Allah will show mercy to those who show mercy (to others). Show mercy to those who are in the earth, He Who is in the Heaven will show mercy to you.” (Abu Dawud and At-Tirmidhi)
“He who does not show mercy to people, Allah will not show mercy to him.” (Al-Bukhârî and Muslim)
And, Allah says:
“O you who believe! Keep your duty to Allah and fear Him, and speak (always) the truth. He will direct you to do righteous good deeds and will forgive you your sins. And whosoever obeys Allâh and His Messenger (peace be upon him), he has indeed achieved a great achievement (i.e. he will be saved from the Hell-fire and will be admitted to Paradise).” (Al-Ahzab 33:70-71)
“The inhabitants of Paradise are three: One who wields authority and is just and fair, and the person who is merciful and kind-hearted towards the poor and towards his relatives, and one who does not stretch his hand in spite of having a large family to support.” (Muslim)