Musannaf Ibn Abi Shayba 7:230

Mu'tamir narrated to us, from Ayyub, from Abu Qilabah, who said: A man came to Abu Bakr and said, "I saw in a dream that I was urinating blood." He said, "I see that you approach your wife while she is menstruating." He said, "Yes." He said, "Fear Allah and do not do it again."