Sunan An-Nasai, Chapter: The Book of Ghusl and Tayammum

that a man became Junub and did not pray. He came to the Prophet (saw) and told him about that, and he said: "You did the right thing." Then another man became Junub so he performed Tayammum and prayed. He came (to the Prophet (saw)) who said to him what he said to the other man - meaning, "You did the right thing." (Sahih)