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Tevillas Keilim on Used things
I was reading up on tevillas keilim and saw the following statements on this site:
Utensils require tevila if they were given by a Jew to a Yehudi as a gift or if they were bought from a aino Yehudi .
this would lead me to think that if one BOUGHT from a Jew, one would not be required to tovel
it is not proper or necessary to investigate if the host complies with the laws of tevilas keilim since we assume G-d fearing Jews comply with the halacha
with these 2 ideas, I have questions --
What happens if I buy from a Jew? Do I have to ask him if the utensils were immersed or should I (like as in the second case, which is for when I am eating at someone's house) assume that they were?
What happens if I know the seller is Jewish but I don't know who he is or have any way of contacting him (for example if I'm buying off of a website which only allows Jewish users)?
Could I start a business in which I buy utensils and then sell them anonymously to Jews so that they don't have to worry about tovelling them?