The first part of verse 16:90 says:
"Allah enjoins justice, generosity and kind treatment with kindred."
The verse 16:90 is being recited in Jumuah khutbas every Friday in millions of Masajid throughout the world since the time of Umar bin Abdul Aziz (may Allah T'ala be please with him).
The first of these three commandments of Allah T'ala is justice which has two aspects.
To make such arrangements as may enable everyone to get one's due rights without stint. Justice does not, however, mean equal distribution of rights, for that would be absolutely unnatural. In fact, justice means equitable dispensation of rights which in certain cases may mean equality. For example, aII citizens should have equal rights of citizenship but in other cases equality in rights would be injustice. For instance, equality in social status and rights between parents and their children will obviously be wrong. Likewise those who render services of superior and inferior types cannot be equal in regard to wages and salaries. What AIIah enjoins is that the full rights of everyone should be honestly rendered whether those be moral, social, economic legal or political in accordance with what one justly deserves.
A Poem on Prophet Muhammad (s.a.a.w.) by Allama Iqbal
He slept on a mat of rushes,
But the crown of Chosroes lay beneath the feet of his followers;
He chose the nightly solitude of Mount Hira,
And founded a nation, law and government;
He passed his nights with sleepless eyes,
That his Millet might sleep on Chosroes throne
In the hour of battle, iron was melted by the flash of his sword.
At prayer time, tears fell like drops of rain from his eyes.
In his prayer for Divine help, his Amen' was a sword,
Which extirpated the lineage of kings.
He inaugurated a new Order in the world,
He brought the empires old to an end:
In his sight the high and the low were one,
He sat with the slave at table one;
He burnt clear the distinctions of birth and clan.
His fire consumed all this trash and bran.
The phrase righteous deeds is commonly translated as good actions. But, if we look deep into it, we would discover more significance hidden behind it. The two locutions ‘action’ and ‘activity’ are generally taken to convey the same sense. But there is a subtle difference in their meaning. Any kind of movement or work can be called activity, but the word action usually implies some strenuous or arduous work. On the other side, the word ‘virtuous’ or ‘righteous’ denotes something which had developmental characteristics and potential for enhancement. By combining these two, we would realize that the actual significance of this term is that it is necessary for man to put up a hard struggle to achieve that real goat for which he was potentially created, and he had to ascend certain heights to attain that goal. All this is conveyed by the comprehensive word ‘righteous deed’.