...If Imam Mahdi Appears

Allama Majlisi has related the following narration about Imam Mahdi in Bihar al-Anwar

"When Imam Mahdi reappears, he will rule with justice, and no one will be able to discriminate against another. Roads and paths will become secure, the Earth will bring out its bounties, all rights will be returned to their rightful owners, and no follower of a religion will remain until he becomes a Muslim and professes his faith."

Explanation

Seven programs have been mentioned for His eminence in this narration

1 & 2. A just government and elimination of discrimination: The first part of the tradition states that when Imam Mahdi reappears, he will rule with justice and wipe out discrimination
The antonym of justice ('Adl) is injustice (Dhulm). And the word equity (Qist) is the opposite of discrimination (Jawr)

The difference between justice and equity is that justice means that another's right is not taken, and equity means that discrimination does not take place. Thus, injustice means to take one's right for one's own benefit, and inequity means to give one's right to another. For example, if I take John's house for myself, it is injustice. And if I take his house and give it to someone else, it is inequity. The opposite of the first example is that I don't take John's house for myself; this is justice. And the opposite of the second example is that I don't take his house and give it to someone else; this is equity. Therefore, equity is the lack of discrimination, and justice is the lack of injustice.

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