Allah's Messenger said: "Wudu is (required) from what fire has touched, even if it be a piece of cheese."
Jami` at-Tirmidhi Book 1, Hadith 79
← Previous Hadith "The companions of Allah's Messenger would sleep, then stand to pray, They would not perform Wudu."

Jami` at-Tirmidhi Book 1, Hadith 78 Next Hadith → "Allah's Messenger went out and I went with him. He entered upon a woman from the Ansar. She slaughtered a sheep and he ate from it; and she brought a basket with ripe dates and he ate from it. Then he performed Wudu for Zuhr and prayed. Then he finished, so she brought him something from the remainder of the sheep. So he ate it, then prayed Asr and did not perform Wudu."

Jami` at-Tirmidhi Book 1, Hadith 80