Aḥmad ibn Yaḥyá al-Balādhurī, The Origins of the Islamic State (1916)
“ By such means, they enriched themselves. Hence, the saying, "It is good to be in authority even over stones." [9] This saying, however, is, according to al-Athram, explained by abu-ʿUbaidah by the fact that al-Ḥajjâj ibn-ʿAtîk ath-Thaḳafi, or his son, had charge of cutting the pillars for the al-Baṣrah mosque from Jabal al-Ahwâz where he discovered a mine. This gave rise to the expression: "It is good to be in authority even over stones." Abu-ʿUbaidah states that the colonization of al-Kûfah took place in the year 18. ”
