Malik al-Ashtar (مالک الأشتر) was one of the especial companions of Imam Ali (a) and one of the powerful leaders of Iraq. He was one of the commanders of the army of Imam Ali (a) who was forethoughtful in politics and strong in battle. He participated in the Battle of Jamal and the Battle of Siffin and eventually he was appointed by Imam 'Ali (a) as governor-general in Egypt. However, he was martyred before arriving to Egypt.
The famous treaty of Malik al-Ashtar is a letter that Imam Ali (a) wrote to him while he was in Egypt.
Qom- DarolErfan/ the researcher, exegete and scholar of Quranic sciences said: if someone wants to utilize from the fruit of a pure tree like Imam Ali peace be upon him, he can refer to Nahjul Balagheh (peak of elequence), if a country or a nation wants to be one hundred percent Islamic, it should act based on Malik al-Ashtar treaty.
Professor Ansarian referred to Holy prophet,s speech about Imam Ali peace be upon them and said: the holy Prophet(PBUH) said about Imam Ali peace be upon him: Oh dear Ali! If I introduce you to people in this young age, I am afraid that all people forget Allah Almighty and worship you. Oh dear Ali! If all the seas become ink, if all the trees become pens. If all Jinn and humankind become authors and want to write about your virtues and values, the pens would be finished, the seas that have turned into inks would be dried, the Jinn and humankind would die but your values and virtues are not yet finished. Ali (a.s) is a blessing that is given to shias and you men, women, girls, youth, clerics and so on…stick and adhere to this pure tree, there are eleven other trees (the Infallible Imams) who are linked to this pure tree.
source : erfan.ir