Ruling on one who doubts his ritual purity regarding missed prayers

Question:
He once performed wudu' (ablution), and someone drew his attention to a spot on his foot that had not been washed. On another occasion, someone drew his attention to a similar spot. This caused him to doubt whether he had performed wudu' correctly before that. He asks about his previous state, in which he doubts the validity of his wudu', as well as his ghusl (full ritual bath) from janabah (major ritual impurity). Should he repeat his prayers, or what should he do?

Answer:
The fact that the questioner was drawn to a spot on his foot once or twice, where water did not reach when he performed wudu', does not mean that his other acts of purification are invalid. The original state, if Allah wills, is that he performed a valid wudu', and the original state is not invalidated by doubts. The same applies to his ghusl from janabah; the original state is that it was sound, and he does not have to repeat the prayers he has already performed.