It is narrated from Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) came out to us and said: "How excellent are those who do khilal in food and in ablution!"
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4047