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 zabiha 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 salat, he should take it off immediately and his salat would be valid. The same rule would apply if he forgot [that he had the wallet or the belt on him] and remembered during salat, provided that his forgetfulness was not a result of carelessness and indifference. In other cases, he will have to repeat salat in time or qadha as a matter of obligatory precaution.