Forty Hadith an-Nawawi
Speak good or keep silent; honour the neighbour and the guest
Sahih
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]