What is the ruling on one who divorced his wife with three pronouncements in a single sitting, by saying: "You are divorced, divorced, divorced," with the intention of three, and is reconciliation possible after this divorce, and how was divorce during the time of the Messenger of Allah, peace and blessings be upon him?

The answer to your question is as follows:

1. Triple Divorce with a Single Utterance:

The Majority Opinion: If a man says to his wife, "You are divorced, divorced, divorced," and intends to enact the divorce with all three utterances, then three divorces are binding upon her. This holds true even if he uttered them during a period of purity in which intercourse had occurred.

Ibn Taymiyyah's Opinion: Divorce does not occur if it is uttered during a period of purity in which he had intercourse with her, and uttering triple divorce in one sitting counts as only one divorce, because it is an unlawful, innovative divorce (talaq bid'i).

2. Ibn Abbas's Hadith and Triple Divorce:

During the time of the Prophet (peace be upon him), Abu Bakr, and for two years of Umar's caliphate, triple divorce was counted as a single divorce.

Ibn Taymiyyah used this hadith as evidence that triple divorce uttered with a single expression counts as only one.

Some scholars interpreted the hadith to mean that people in the time of the Prophet (peace be upon him) would enact a single divorce instead of three.

3. The Adopted Fatwa: The adopted fatwa is the opinion of the majority, which is that triple divorce occurs in the scenario asked about, and thus the wife becomes unlawful to her husband until she marries another husband in a genuine marriage and he divorces her after consummation.