On the authority of Abu Hurayrah (may Allah be pleased with him), that the Messenger of Allah (peace and blessings of Allah 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.[Al-Bukhari][Muslim] (DE)
Reference (DE): 40 Hadith Nawawi 15 (DE)
English translation (DE): Hadith 15 (DE)