Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: The Prophet (peace and blessings be upon him) said: "Whoever believes in Allah Almighty and the Last Day should not harm his neighbour; whoever believes in Allah Almighty and the Last Day should honour his guest; and whoever believes in Allah Almighty and the Last Day should speak good or else remain silent."
Imam al-Bazzar recorded it. There is weakness in some of its narrators, though they have been declared trustworthy.