It is narrated from Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) that he sent some vegetables to the Messenger of Allah (peace and blessings be upon him) in which there was onion or leek (a vegetable resembling garlic). When he saw that the Messenger of Allah (peace and blessings be upon him) had not eaten any of it, he too refused to eat it. the Messenger of Allah (peace and blessings be upon him) said to him: "What is preventing you from eating it?" He said: "I did not find the trace of the Messenger of Allah (peace and blessings be upon him)'s eating in it." So the Messenger of Allah (peace and blessings be upon him) said: "I feel shy before the angels of Allah (who come to me with revelation), while it (eating onion and the like) is not forbidden." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), and they did not record it.