What is the ruling on one who performs tayammum (dry ablution with clean earth) while he is able to obtain water from someone else?

Question:
A man experienced a wet dream at night while he was in the desert. He had approximately fifty liters of water with him and was able to obtain water from others. He prayed for two days. When he went to his family, he performed ghusl (the full ritual bath). Does he owe anything? Are the acts of worship performed after or before the ghusl valid?

Answer:
If the water was near him and he performed tayammum, this is not valid. If the water is near him, he must go to it. For this reason, the jurists say that he must seek water in his camp and in its vicinity. So, if the water is near him, it is not permissible for him to perform tayammum because he is one who has found water. Allah, Mighty and Majestic, says: “But if you do not find water…” and this man has found water near him. However, if the water is far from him, he may perform tayammum, and his prayer is valid because he is not one who has found water, as it is far from him.