Musnad Ahmad 32:994

Isma'il ibn Ibrahim narrated to us, 'Abd al-'Aziz ibn Suhayb narrated to us, he said: Anas ibn Malik was asked about garlic, and he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever eats anything from this plant, let him not approach us — or let him not pray with us."