It wasnarrated from 'Umar that the Messenger of Allah (ﷺ) said:
'Season(your food) with olive oil and anoint yourselves with it, foritcomes from a blessed tree." (ID)
English reference (ID): Vol. 4, Book 29, Hadith 3319 (ID)
Arabic reference (ID): Book 29, Hadith 3444 (ID)