"The Messenger of Allah (ﷺ) said: 'Allah does not accept Salah without purification, nor charity from Ghulul.'"

That which is taken from the spoils of war prior to their distribution.
Sunan an-Nasa'i Book 1, Hadith 140
← Previous Hadith "I heard Jabir say: 'I fell sick, and the Messenger of Allah (ﷺ) and Abu Bakr came to visit me. They found me unconscious, so the Messenger of Allah (ﷺ) performed Wudu' and poured his Wudu' water over me.'"

Sunan an-Nasa'i Book 1, Hadith 139 Next Hadith → "A Bedouin came to the Prophet (ﷺ) to ask him about Wudu', so he showed him how to perform Wudu', washing each part three times, then he said: 'This is Wudu'. Whoever does more than that has done badly, done to extremes and done wrong.'"

Sunan an-Nasa'i Book 1, Hadith 141