If I pray with a leather belt or a wallet made from leather of a mayta and realize it during the salat or…

Answer

The prayer with a wallet made from leather of a Mayta is valid just as it is acceptable to pray with a belt made from such a leather, provided that the probability of it being from an animal Islamically slaughtered is not a very low probability that would be ignored by sensible people. In the second case [of very low probability], if he was ignorant [of this rule] and realized during prayer, he should take it off immediately and his prayer would be valid. The same rule would apply if he forgot [that he had the wallet or the belt on him] and remembered during prayer, provided that his forgetfulness was not a result of carelessness and indifference. In other cases, he will have to repeat prayer within the allocated time period or Qadha as a matter of obligatory precaution.