Should one repeat the Maghrib and Isha prayers after discovering the inner clothing was contaminated, having performed the prayers with the same ablution?

What is found in undergarments after prayer does not affect its validity, unless it is known to have exited from one of the two private parts after ablution and before prayer. Otherwise, it is either clean dirt that does not affect it, or an impurity that occurred after the prayer, which must be purified for the future. Or it is an impurity that was present in the garment before the prayer and did not exit from the private parts after ablution, in which case the prayer of one who was unaware of its presence is valid, according to the more preponderant opinion.