Authentic
Jami' at-Tirmidhi 1852
"The Prophet (ﷺ) said: Eat of its oil and use it (the olives), for indeed it is from a blessed tree." [Abu 'Eisa said:] This Hadith is Gharib from this route. We only know of it from the narration of Sufyan At-Thawri, from 'Abdullah bin 'Eisa.
" كُلُوا الزَّيْتَ وَادَّهِنُوا بِهِ فَإِنَّهُ مِنْ شَجَرَةٍ مُبَارَكَةٍ "