It was narrated that Abu Raja' said:"I heard 'Imran bin Husain (say) that the Prophet (ﷺ) saw a man who was by himself and did not pray with the people. He said: 'O So and so, what kept you from praying with the people?' He said: 'O Messenger of Allah, I have become Junub and there is no water.' He said: 'You should use earth for that will suffice you
It was narrated that Abu Dharr said:"The Messenger of Allah (ﷺ) said: 'Clean earth is the Wudu' of the Muslim, even if he does not find water for ten years
It was narrated that 'Aishah said:"The Messenger of Allah (ﷺ) sent Usaid bin Hudair and some other people to look for a necklace that 'Aishah had left behind in a place where she had stopped (while traveling). The time for prayer came and they did not have Wudu', and they could not find any water, so they prayed without Wudu'. They mentioned that to the Messenger of Allah (ﷺ), and Allah, the Mighty and Sublime revealed the verse of Tayammum. Usaid bin Hudair said: 'May Allah reward you with good, for by Allah, nothing ever happened to you that you dislike, but Allah makes it good for you and the Muslims
It was narrated from Tariq that a man became Junub and did not pray, then he came to the Prophet (ﷺ) and mentioned that to him. He said:"You did the right thing." Another man became Junub and performed Tayammum and prayed, and he came to him and he said something similar to what he had told the other man - meaning, you did the right thing