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." (ES)
English reference (ES): Vol. 4, Book 29, Hadith 3319 (ES)
Arabic reference (ES): Book 29, Hadith 3444 (ES)