Musannaf Ibn Abi Shaybah 17834 — Those who said: her husband may have

Bakr bin Abdullah said: It reached me that al-Hajjaj said: When a woman is in doubt about menstruation, she should take a ritual bath (ghusl) and pray, and her husband should not approach her until she becomes pure. He (Bakr) said: What an evil thing he said! Prayer is of greater sanctity.