Sayyida Umm Salama (may Allah be pleased with her) narrates: She said to the Prophet Muhammad (peace be upon him): I am a woman who has her hair braided or tied, so should I undo them for ghusl (ritual bath) due to janabah (major impurity)? The Prophet Muhammad (peace be upon him) said: It is sufficient for you to pour water over your head three times. Pour water over your entire body, in this way you will become pure.
Hadith Referenceصحیح ابن حبان / كتاب الطهارة / 1198
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «صحيح أبي داود» (246): م.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط مسلم.