Sayyidina Abu Huraira (RA) 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 When you hear a hadith of the Prophet (RAW) do not cite example for that."