Bishr bin Abdullah al-Khath'ami narrates: I went to Muhammad bin Ali bin Husayn (Imam Muhammad al-Baqir) (may Allah have mercy on him), and his son was with him. He said: Come and eat. I said: O son of the Messenger of Allah! I have already eaten. He said to me: But this is hindiba (endive). I said: O son of the Messenger of Allah! What is special about hindiba? He said: My father narrated to me from my grandfather that the Messenger of Allah (peace and blessings be upon him) said: "There is not a single leaf of the hindiba leaves except that there is a drop of the water of Paradise upon it."
Then oil was brought, and he said: Apply some oil. I said: O son of the Messenger of Allah! I have already applied oil. He said: But this is violet oil. I said: What is special about violet? He said: My father narrated to me from my grandfather, who said: The Messenger of Allah (peace and blessings be upon him) said: "The superiority of violet oil over all other oils is like the superiority of the descendants of Abd al-Muttalib over the rest of Quraysh, and the superiority of violet oil is like the superiority of Islam over all other religions."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2879