It is narrated from Imam Sadeq (AS) who narrated from his father and he narrated from the Prophet of Islam (PBUH) who said:

The closest of you to me on the Day of Judgment, are those who are more truthful (than others), the ones who are more trustworthy than others, the ones who adhere more than others to their commitments and agreements, and those who are more good-tempered and more popular with people [1].

[1] Amaali, Sheikh Toosi (RA), Majlis-e-Hashtoom, Page 229.

Source: en.shafaqna.com