Hadith 31-141

وَبِهذَا الإِسنادِ عَنْ عَلِىِّ بْنِ أَبِي طالِبٍ‏ عَلَيْهِ السَّلامُ قالَ: قالَ رَسُولَ اللَّهِ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: عَلَيْكُمْ بِالزَّيتِ فَكُلهُ وَادَّهِن بِهِ، فَإِنَّ مَن أَكَلَهُ وَادَّهَنَ بِهِ لَمْ يَقرَبهُ الشَّيْطانُ أَرْبَعِينَ يَوْماً.

According to the same documentation, Ali ibn Abi Talib (a.s.) narrated that God’s Prophet (S) said, “I advise you to take olive oil and rub it on your hair. Satan will not approach anyone who eats olive oil or wipes it on his hair for forty days.” [40]