It wasnarrated from Abu Hurairah that the Prophet (ﷺ) said:
"Whoeverapplies kohl, let him do it an odd number of times. Whoeverdoes thathas done well, and whoever does not, it does not matter." (TR)
English reference (TR): Vol. 4, Book 31, Hadith 3498 (TR)
Arabic reference (TR): Book 31, Hadith 3627 (TR)