A believer does not become inpure

 168. Abu Hurairah, narrated that he met the Prophet salla alayhi wa sallam on one of the paths leading to Al-Madinah, at that time he was junub. He slipped away and took a bath. The Prophet salla alayhi wa sallam searched for him and when he came, he asked him: ´´o Abu Hurairah, where were you?´´ He said: O Messenger of Allah, you met me when I was Junub, so I dit not like to sit in your companu before taking a bath.´´ The Messenger of Allah salla alayhi wa sallam said: ´´Subhan Allah (Allah is free from every imperfection). Verily, a believer never becomes impure.´´