Ja'far bin Burqan (may Allah have mercy on him) said that Umar bin Abd al-Aziz (may Allah have mercy on him) wrote to Adi bin Adi al-Kindi (may Allah have mercy on him): Look, where there are permanent settlements whose people do not move repeatedly from one place to another, appoint an amir over them, and let him lead them in the Friday prayer.
The Shaykh said: What is most consistent with the sayings and practices of the Salaf regarding establishing the Friday prayer in villages whose people are settled, not tent-dwellers who move from place to place, is that this is what Ali bin Abi Talib (may Allah be pleased with him) meant.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5614