It is narrated from Sayyiduna Abu Ayyub (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Ablution should be performed after touching the private part," and sometimes he said: "Whoever touches his private part, let him perform ablution."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3913
It is narrated from Sayyiduna Abu Ayyub (may Allah be pleased with him) that whenever the Prophet (peace and blessings be upon him) ate something cooked over fire, he would perform ablution.
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3914
It is narrated from Sayyiduna Abu Ayyub (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Perform ablution after eating what has been touched by fire."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3915