UNDERSTANDING ISLAM:

On the authority of Abu Hurayrah (may Allah be pleased with him), that the Messenger of Allah (peace be upon him) said:

"Let him who believes in Allah and the Last Day speak good, or keep silent; and let him who believes in Allah and the Last Day be generous to his neighbour; and let him who believes in Allah and the Last Day be generous to his guest."

Related by Bukhari & Muslim