Musannaf Ibn Abi Shaybah 19693 — Those who said there is no ila except

Jabir bin Zayd (may Allah have mercy on him) was asked: If a man keeps away from his wife and four months pass, what is the ruling? He said: She does not become unlawful for him, unless he swore by Allah that he would not even touch her and would not reconcile with her. If he swore to that and did not return to her until four months passed, the woman becomes irrevocably separated (ba'inah), and that is the ila'.