Sayyiduna Anas (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) used to apply kohl an odd number of times.
Al-Bazzar recorded it. Its chain contains a narrator, al-Waddah bin Yahya, and he is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطب / 8355