Allah's Messenger said: "The key to Paradise is Salat, and the key to Salat is Wudu'."
Jami` at-Tirmidhi Book 1, Hadith 4
← Previous Hadith the Prophet, said: "The key to Salat is the purification, its Tahrlm is the Takblr, and its Tahlil is the Taslim."

Jami` at-Tirmidhi Book 1, Hadith 3 Next Hadith → "When the Prophet entered the toilet he would say: 'O Allah Indeed I seek refuge in You.'" Shu'bah (one of the narrators) said: "Another time he said: 'I seek refuge in You from AI-Khubthi and al-Khablth.' Or: 'Al-Khubthi and Al-Khaba'ith.'"

Jami` at-Tirmidhi Book 1, Hadith 5