Doing a job before knowing about the price offered

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As-Salaamu-Alaikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
One of our brothers/sisters has asked this question:
What is the ruling if a person does a job, then finds out that the one who wanted it done said “Whoever does such and such will have such and such”?
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Answer:

Praise be to Allaah.

If he does it before finding out that the one who wanted it done said “Whoever does such and such will have such and such” does not deserve the price named. But it is good manners to give him something that will please him, that is similar to or more than the price for this work. 

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.

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