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