the Prophet said: "Whoever touches his penis, then he is not to pray until he performs Wudu"
Jami` at-Tirmidhi Book 1, Hadith 82
← Previous Hadith Allah's Messenger was asked about performing Wudu for camel meat. He said: "Perform Wudu for it." He Was asked about Wudu after eating goat meat. So he said: "Do not perform Wudu for it."

Jami` at-Tirmidhi Book 1, Hadith 81 Next Hadith → a similar report (as no. 82) from the Prophet.

Jami` at-Tirmidhi Book 1, Hadith 83