It is narrated from Imam Sadeq (AS) who said:

Luqman told his child: There are three signs for a jealous person and they are: Gossips about others behind their back; praises people in front of them; and becomes happy by others misfortunes [1].

[1] Al-Khisal, Sheikh Sadooq (RA), Page 121.

Source: en.shafaqna.com