It is narrated from Fatimah bint Qais (may Allah be pleased with her) that Abu Amr bin Hafs gave her the third and final divorce while he was in Syria and not present there (i.e., he sent the divorce from there). His agent sent her some barley, at which she became upset. So he said: "By Allah! You have no right over us at all." (Hearing this) she went to the Messenger of Allah ﷺ and mentioned this matter to him, so he ﷺ said: "It is correct, your maintenance (expenses) are not his responsibility."
Hadith Referenceمسند الإمام الشافعي / كتاب العدد والسكنى والنفقات / 1320
It is narrated from Abu al-Zubair that Jabir bin Abdullah (may Allah be pleased with him) said: The divorced woman is entitled to maintenance as long as she is not forbidden (i.e., as long as the irrevocable divorce has not occurred), and when she becomes forbidden (i.e., when three divorces have taken place), then she should be provided for in a good manner.
Hadith Referenceمسند الإمام الشافعي / كتاب العدد والسكنى والنفقات / 1321
Hadith Takhrijاسناده صحيح اخرجه البيهقى 475/7 - وفى المعرفة السنن والآثار له (3762)۔
Ibn Jurayj (may Allah have mercy on him) narrated that Ata (may Allah have mercy on him) said: For a thrice-divorced pregnant woman, the husband is responsible for nothing except to spend on her because of her pregnancy, and if she is not pregnant, then her maintenance is not upon the husband.
Hadith Referenceمسند الإمام الشافعي / كتاب العدد والسكنى والنفقات / 1322
Hadith Takhrijاسناده صحيح اخرجه البيهقى 375/7 - وفى المعرفة السنن والآثار له (4763) - وعبد الرزاق (12015)۔