Musnad Ahmad 1156:54

Yazid ibn Harun narrated to us, he said: Muhammad—meaning Ibn ‘Amr—informed us, from Abu Salamah, from Umm Salamah, she said: I menstruated while I was with the Prophet, peace and blessings of Allah be upon him, in his garment. She said: So I slipped away. He said: "Are you menstruating?" I said: O Messenger of Allah, I have found what women find. He said: "That is what has been written for the daughters of Adam." She said: So I went off and set myself right, and I bound myself with a cloth, then I came and entered into the garment with him.