“I shall not loose sight of the labor of any of you who labors in My way, be it a man or a woman;
for each of you is equal to each other in the sight of me.” (3:195)
“Woe to those that deal in fraud. Those who when they have to receive by measure, from men exact full measure, but when they have to give by measure, or weight to men, give less than due.” (83:1-3)
“Give full measure when you measure out and weigh with a fair balance. This is fair and better in the end” (17:35).
“Give just measure, and cause no loss [to others by fraud]. And weight with scales true and upright and withhold not things justly due to me, nor do evil in the land, working mischief.” (26:181-183)
“Men shall have the benefit of what they earn, and women shall have the benefit of what they earn” (4:32)
“Do they distribute the mercy of your Lord? It is We who have apportioned among them their livelihood in the life of this world and have raised some of them above others in degrees [of rank] that they may make use of one another for service. But the mercy of your Lord is better than whatever they accumulate.” [Az-Zukhruf 43:32]

Hadith (teachings) of the Prophet Mohammed

 “He upon whom his brother has a right, be it of the nature of money or honor, let him compensate for it before he is made to compensate for it on a day when there will be neither dinar nor dirham to deal with. Instead, if he has a good deed in his account it will be taken away from him and given to the person he had wronged. And if he has no good deeds in his account, sins of the other person will be taken from him and added to his account” (al-Bukhari). 

Your employees are your brothers upon whom Allah has given you authority, so if a Muslim has another person under his control, he/she should feed them with the like of what one eats and clothe them with the like of what one wears and you should not overburden them with what they cannot bear and if you do so, help them in their jobs.

Someone who eats with his servant, rides a donkey in the markets, and ties up his sheep and milks it is not proud.”

“Whoever employs someone to work for him, he must specify for him his wage in advance.” [‘Abdur-Razzaaq]

‘I will be an opponent to three types of people on the Day of Resurrection: one who makes a covenant in My name but proves treacherous;   one who sells a free person and eats his price; and one who employs a worker and takes full work from him but does not pay him for his labor'” (Al-Bukhari).

“You should pay the laborer his wages before his sweat dries” (Sunan Ibn Mâjah (2443)).

 “The procrastination of the rich is [a form of] oppression.” 

“Whoever oppressed another for a hand span measure of land will have a collar of seven lands placed around his neck on the Day of Judgment.”

 “Fulfill the measure and weight and do not deprive people of their due and cause not corruption upon the earth after its reformation.” (Al-A`raf 7:85)

“Whoever lightens the work of his workers will have the reward on his scales.” 

“While three persons were traveling, they were overtaken by rain and they took shelter in a cave in a mountain. A big rock fell from the mountain over the mouth of the cave and blocked it. They said to each other: ‘Think of such righteous deeds which you did for Allah’s sake only, and invoke Allah by mentioning those deeds so that Allah may relieve you from your difficulty.’ One of them said, ‘O Allah! I employed a laborer for wages equal to a faraq (a certain measure) of rice, and when he had finished his job he demanded his wages, but when I presented his due to him, he gave it up and refused to take it. Then I kept on sowing that rice for him (several times) until I managed to buy, with the price of the yield, some cows and their shepherd. Later on the laborer came back to me and said: ‘Be afraid of Allah, and do not be unjust to me and give me my due.’, I said to him: Go and take those cows and their shepherd. So he took them and went away. If You considered that I had done that for seeking Your pleasure, then please remove the remaining part of the rock. And the rock was shifted. … and each one mentioned a good deed until they were freed’” [al-Bukhari].