whoever believes in Allah and the Last Day should speak goodness or remain silent.

Narrated Abu Shurayh Al-Khaza’I (رضي الله عنه): The Messenger of Allah (صلى الله عليه وسلم) said:

مَنْ كَانَ يُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ فَلْيُكْرِمْ ضَيْفَهُ، وَمَنْ كَانَ يُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ فَلْيُحْسِنْ إِلَى جَارِهِ، وَمَنْ كَانَ يُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الآخِرِ فَلْيَقُلْ خَيْرًا أَوْ لِيَصْمُتْ

Whoever believes in Allah and the Last Day should honor his guest, and whoever believes in Allah and the Last Day should behave well towards his neighbor, and whoever believes in Allah and the Last Day should speak goodness or remain silent.

[Sahih Muslim, Book 1, Number 0075]

===

source : http://www.faithinallah.org/al-bayhaqi-excellence-and-generosity-toward-neighbors/