Lady Aisha (may Allah be pleased with her) narrates: Once the Prophet Muhammad (peace be upon him) performed ghusl (ritual bath) after janabah, then he noticed a small part on his skin where water had not reached, so he squeezed some water from his hair and applied that water to that spot.
Hadith Referenceسنن الدارقطني / كتاب الطهارة / 396
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 396، انفرد به المصنف من هذا الطريق»