One has to wash his whole body with water so that water reaches every part of his body. If he starts off with ablution, or ends his bath with ablution, then he does not have to perform ablution to pray.
(And if you are in a state of ˹full˺ impurity,1 then take a full bath.) Al-Ma’idah 5: 6
يغتسل بالماء و ذلك أنه يعمم بدنه بالماء حتى يوصل الماء إلى جميع أجزاء البدن. فإن بدأ بالوضوء أو جعل الوضوء بعد تعميم البدن فقد أجزاه عن الوضوء.
(وَإِن كُنتُمْ جُنُبًا فَاطَّهَّرُوا )المائدة 5: 6﴾