From Sahih Bukhari (Hadith 285):
Narrated Abu Huraira:Allah's Messenger (ﷺ) came across me and I was Junub. He took my hand and I went along with him till he sat down I slipped away, went home and took a bath. When I came back, he was still sitting there. He then said to me, "O Abu Huraira! Where have you been?' I told him about it. The Prophet (ﷺ) said, "Subhan Allah! O Abu Huraira! A believer never becomes impure
Reference: Bukhari 285