Repeating the full ritual bath after finding water for one who performed dry ablution for major ritual impurity

Question:
Honorable Shaykh, may Allah grant you success. If a person is in a state of major ritual impurity and performs dry ablution because there is no water, then prays with that dry ablution, does he have to repeat this purification for major ritual impurity with water if he finds water afterwards?

Answer:
If he did not find water, he uses it for the future. As for what he prayed with dry ablution in the past, his prayer is valid. But in the future, he must perform the full ritual bath with water to pray the upcoming prayers.