What is the ruling on settling on a wage between the worker and the employer, and then the situation changes?

Question:
My father has two workers in his commercial establishment, and there is no doubt about their trustworthiness or their sincerity. He partnered with them in the profits of the shop, taking half for himself and distributing the remaining half equally among them. However, one of them travels to his country and then returns to work in my father’s shop. They agreed that he would be given the wage of a worker or a driver, and that this would be to his benefit. Do you know what the ruling of the Shari'ah is in this matter? You have said more than once that if they agree on something, there is no harm, if for example he has work in the shop, a grocery store or otherwise, and he says, "Do you work in it? Do you sell in the grocery store or buy in it, or in any other work they do in it, for half of what they profit?" He gives them the money and they work for half.

Answer:
There is no harm in this; it is a partnership. And if he says to the second person who goes and comes back, "You are on your work and you are on your terms," and a second worker is with him, and they agreed on this, there is no harm. Muslims are bound by their conditions.