It has been narrated from Waathila and Abu Hurayrah the Messenger of Allah (sallahAllaahu alayhi wasallam) said:
“Be from the people characterized with War’a  ; you will be from the best people in servitude,
And be content; you will be from the most thankful among the people,
And love for the people what you love for your self; you will be a believer,
And be a good neighbor; you will be a Muslim,
And lessen laughter; for indeed a lot of laughter deadens the heart.”
Narrated by Ibn Maajah, and al-Bayhaqee in Zuhd al-Kabeer. Albaani graded it as (Saheeh Lighayrihi)
1. This is the act of leaving off some actions fearing they might be impermissible or lead to that which is impermissible.