The reason for the woman (who was divorced thrice) to marry another man must be that the man desires her and has the intention of having an extended married life with her. These are the legal goals and aims behind marriage. If the reason behind the second marriage was to make the woman eligible for her ex-husband again, then this is the Tahlil that the Hadiths have cursed and criticized. In addition, when the reason behind this marriage (if it was Tahlil) is announced in the contract, it would make the contract invalid according to the majority of the scholars.
Imam Ahmad reported that `Abdullah bin Mas`ud said, "Allah's Messenger cursed the one who does Tahlil, the one in whose favor it is done, those who eat Riba (usury) and those who feed it (pay the usury).'' At-Tirmidhi and An-Nasa'i reported this Hadith and At-Tirmidhi said, "This Hadith is Hasan.'' He said, "This is what is acted upon according to people of knowledge among the Companions, among whom are `Umar, `Uthman and Ibn `Umar. It was also the saying of the scholars of Fiqh among the Tabi`in (second generation of Islam). And it has been reported from `Ali, Ibn Mas`ud and Ibn `Abbas''.
In his Mustadrak, Al-Hakim reported that Nafi` said: "A man came to Ibn `Umar and asked him about a man who divorced his wife three times. Then, his brother married her to make Tahlil for his brother, without the brother knowing this fact. He then asked, "Is she allowed for the first (husband)'' He said, "No, unless it is a marriage that involves desire. We used to consider this an act of adultery during the time of Allah's Messenger .'' Al-Hakim said, "This Hadith has a Sahih chain although they (Al-Bukhari and Muslim) did not record it.''The wording of this Hadith indicates that the ruling came from the Prophet . Abu Bakr bin Abu Shaybah, Al-Jawzjani, Harb Al-Kirmani and Abu Bakr Al-Athram said that Qabisah bin Jabir said that `Umar said, "If the participants to Tahlil are brought to me, I will have them stoned.''