Shama-il Tirmidhi Chapter 25, Hadith Number 8 (150).

It is related from ‘Umar Radiyallahu ‘Anhu that Rasulullah Sallallahu Aayhi Wasallam said: “Use olive oil in cooking and rubbing (on the body) because it is from a mubaarak tree”.

Commentary.
The reason for mentioning this hadith in the practices of Sayyidina Rasulullah Sallallahu’Alayhi Wasallam is, that if he encouraged the use of olives, he must have used it himself.