It was narrated that Humaid bin 'Abdur-Rahman said: "I met a man who accompanied the Prophet ( صلی اللہ علیہ وسلم ) as Abu Hurairah (may Allah be pleased with him), accompanied him for four years. He said: 'The Messenger of Allah ( صلی اللہ علیہ وسلم ) forbade any one of us to comb his hair each day, [1] or to urinate in the place where he performs Ghusl, or for a man to perform Ghusl using the leftover water of a women, or a woman to perform Ghusl using the leftover water of a man - they should scoop it out together.'" [1] It is said this is to prevent him from making his physical appearance his main aim.