Q: i sat on impurity that was totally dry.  I was told that all my salah i read with this clothing is invalid and i must repeat it but Allahsuhanahu waTa’ala loves purity.  I am poor so i wear my clothing for 3 days at a time.  So i must repeat about 15 prayers.  Is this true?

A: If the impurity was dry at the time you sat on it and there was no transfer between the solid impurity and your clothing, in such an event you would not need to repeat the prayers.

For the sake of precaution, merely wash the clothing; this would take away the whispers of shaytaan as it relates to doubt.

Allah Certainly Knows Best.