Musannaf Ibn Abi Shaybah

Hazrat Umar bin Khattab and Hazrat Uthman bin Affan (may Allah be pleased with them) say that in the case of a woman's husband going missing, she will wait for four years and then observe an 'iddah of four months and ten days.

Hazrat Umar (may Allah be pleased with him) said that in the case of a woman's husband going missing, the woman will wait for four years, then the guardian of the man will be called and he will divorce the woman, after which she will observe a waiting period of four months and ten days.

Hazrat Saeed bin Musayyib says regarding the missing person that his wife will observe 'iddah for one year.

Hazrat Yahya bin Ja'dah narrates that during the time of Hazrat Umar (may Allah be pleased with him), a man was taken away by jinn. His wife came to Hazrat Umar (may Allah be pleased with him) and explained the whole situation. Hazrat Umar (may Allah be pleased with him) ordered her to wait for four years. After four years, he ordered the guardian of the husband to divorce the woman. Then he instructed the woman to observe the waiting period ('iddah). When the 'iddah is completed, she may marry. And if her husband returns, the man will be given the choice between his wife and the dowry.

Hazrat Saeed bin Musayyib says regarding the missing person that his wife will observe 'iddah for one year.