Ruling on disposing of samples after testing them

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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:
My wife works in a petroleum store. They test the samples of petrol by taking an amount of about 1.5 liters of petrol. These quantities are transferred by cars, in tanks. Is it permissible for me to take these samples after they finish testing them? I mean to put such samples into my car’s tank and use them. Note that the samples are not returned after testing.
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Praise be to Allaah.

If the samples are to be returned after examining them, then they belong to them and it is not permissible to anyone to take any of them without their permission, because the Prophet (peace and blessings of Allaah be upon him) said: “The wealth of a man is not permissible unless he gives it willingly.” Narrated by Ahmad (20172); classed as saheeh by al-Albaani in Saheeh al-Jaami’ (7662). 

But if these samples are not returned to the owners because they no longer want them, rather they may be consulted as to do with them, then if they allow those who take them to dispose of them, it is permissible for the employees to take them and dispose of them. 

It is permissible – even obligatory – for them to take them if they have been told to get rid of them, because Islam forbids wasting wealth and enjoins being grateful for blessings, and wasting them is contrary to these two commands. 

It seems – and Allaah knows best – that the owners of these samples are not asking for them and they regard them as no longer belonging to them; if that is the case then there is nothing wrong with anyone taking them, and it is like the wealth that a person leaves because he no longer wants it, so the one who takes it becomes its owner, as the scholars said. 

See: al-Mughni (5/347). 

And Allaah knows best.

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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