Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) narrated: Ablution is not obligatory because of a nosebleed, vomiting, touching the private part, or (eating) what fire has touched. It was said to him: Some people say that the Messenger of Allah (peace and blessings be upon him) said: "Perform ablution from what fire has touched." He said: People heard it but did not retain it properly. We used to call washing the hands and washing the mouth 'wudu', and that is not obligatory. The Messenger of Allah (peace and blessings be upon him) ordered the believers to wash their hands and mouths after (eating) what has been cooked on fire, and that is not obligatory.
Mutarrif bin Mazin has been criticised (by the scholars). And Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 668
Hadith Gradingمحدثین:ضعيف
Hadith Takhrij«ضعيف۔ أخرجه الطبراني في الكبير 134»