If a person cannot get the Makhraj of Dhaad correct, and whilst performing Salaat, he recites in a way that the Dhaad sounds like Thaa, or it is not from the correct Makhraj, will such a Salaat be ok?
A person recites سبحان ربي العزيم instead of العظيم in Ruku. Does this invalidate his Salaat?
Answer:
If one reads سبحان ربي العزيم with a ز, this will invalidate the Salah; therefore, if he cannot pronounce سبحان ربي العظيم adequately, he may recite سبحان ربي الكريم until the time when he is able to pronounce العظيم سبحان ربي correctly and properly. (Shaami Vol. 1 Pg. 494)