It is narrated from the sixth Shia Imam, Ja’afar Al-Sadeq (AS) who said:
The people of every country/town need three types of individuals to refer to for their affairs of this world and the hereafter, and if they do not have those three; will get into trouble and intimidation. These three types of people are:
- Wise and righteous Faqih (expert in Islamic law)
- Benevolent ruler whom people obey
- Knowledgeable and trusted physician [1].
[1] Tohaful Oqool, Page 321.
Source: en.shafaqna.com