There is a bachur who brought meat to my house on pesach and after eating a little I looked at the package and discovered to my horror that it contains rice. What should I do? He did not look carefully. was I yotzi eating meat through eating it? Am I going to get punished and do we say since I made a mistake it’s ones?
Hopefully it didn’t contain any chometz inside it.
It is hard to determine if it is a shogeg or ones. Regardless though, you would want to do teshuva for what you did, and you surely have charata, therefore you just have to do viduy and express what happened to H-shem. You should also make sure that you are more careful with what you what on Pesach and make some sort of kabala that will insure that this mistake doesn’t repeat itself.