It is narrated from Hazrat Aisha that when I used to apply oil to the blessed head of the Prophet (peace be upon him), I would part the hair from the top of the head and leave the forehead untouched.
Hadith Referenceمسند احمد / مسند النساء / 24594
Hadith Gradingحکم دارالسلام:إسناده ضعيف على نكارة فيه