390. Commandment – And they ask thee concerning menstruation. Say: ‘It is a harmful thing, so keep away from women during menstruation, and go not in unto them until they are clean

[2:223] And they ask thee concerning menstruation. Say: ‘It is a harmful thing, so keep away from women during menstruation, and go not in unto them until they are clean. But when they have cleansed themselves, go in unto them as Allah has commanded you. Allah loves those who turn to Him and loves those who keep themselves clean.’