If someone is careless about taharat issue. He/she don't take care about touching najis things with wet hand or making hand/thing which is najis paak.. But also recites his wajib acts like namaz but regardless of his cloth or body is paak or najisThen will his wajib act gets full filled or he should pray qaza for namaz which he recited while in najis cloths ??

Did the said person pray intentionally knowing they had najasat on them?