Waiting Period of a Woman whose Hayd (menses) is Confused

4. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn ’Isma‘il from Muhammad ibn al-Fudayl from abu al-Sabbah al-Kinaniy who has said the following: “I once asked abu ‘Abd Allah عليه السلام, about the case of a woman who experiences Hayd (menses) once every three months: if she needs to count a waiting period. He (the Imam) said, ‘She must wait for a period of time equal to that when she experienced Hayd normally; thus she counts her waiting period for three Hayd-free periods. Thereafter she can marry if she so wants.’”