they ask you concerning menses. say it is hurtful. so keep away from wives during the menses and do not approach them till they are clean. and when they become clean go into them as allah has commanded you. indeed allah loves the penitent and he loves those who keep clean.
ويسألونك عن المحيض قل هو أذى فاعتزلوا النساء في المحيض ولا تقربوهن حتى يطهرن فإذا تطهرن فأتوهن من حيث أمركم الله إن الله يحب التوابين ويحب المتطهرين