It was forbidden to take it away because anything that is placed in a way that people are used to putting it down has to wait for the person who put it down to come pick it up, but at the moment that the child took it the law is that since there was a mark on the arrangement, it should be announced.
And what is being discussed here is not related to a small legal matter that was harmful since it is currently possible for the parents to keep it and declare it, therefore it is considered as restitution of a loss for them to keep it for the benefit of the loser.
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