Sunan at-Tirmidhi (Jami-al-Tirmidhi), Chapter: Taharah (Purification)

reported that Allah's Messenger (SAW) said, ablution becomes wajib on eating something cooked on fire, even a piece of qur'ut." Sayyidina lbn Abbas (RA) asked Sayyidina Abu Huraira (RA), "Shall we make ablution after consuming oil and using hot water?" So, he said, "Nephew! When you hear a hadith of the Prophet (RAW) do not cite example for that." [Ahmed7609, 7679, 9524, Ibn e Majah 485, Muslim 352]