If he took money to do Hajj on behalf of someone, and it was too little or too much, what is the ruling?

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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:
If a man gives another man a specific amount of money to do Hajj on behalf of a deceased person, and the man goes to Hajj but this money is too little or too much, what is the ruling in that case? I also hope you can tell me whether he will have a reward if he does these rituals well on behalf of the deceased.
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Answer:
Praise be to Allaah.

The Muslims are bound by their conditions, so if the giver and taker agreed that the taker would return any extra money and that the giver would make up any shortfall, then each of them must fulfil his obligations. If there was no such condition then he may take any extra money and he should make up any shortfall himself. But he will have the reward in sha Allah if he takes the money with a sound intention and fulfils the obligation.  

And Allaah is the Source of strength. 

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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