It was narrated that 'Abdullah bin 'Amr said: "The Messenger of Allah ( صلی اللہ علیہ وسلم ) said: 'Do Wudu' properly.'" [1] [1] Isbighu Al-Wudu'. And this narration supports the claim that some of them used this expression to mean "three times" for each limb, rather than "properly."