6. Ali has narrated from his father from Ahmad ibn Muhammad from Hammad ibn ‘Uthaman who has said the following: “I once asked abu ‘Abd Allah عليه السلام, about the case of a man who has four wives, of whom he divorces one when he is absent from them. When is it permissible for him to marry? He (the Imam) said, ‘He can do so after nine months because there are two appointed times, the irregularity of Hayd (menses) and the irregularity of pregnancy.’”