(The narrator Isma'il said: I think ash-Sha'bi attributed this tradition to the Prophet)

The Prophet (ﷺ) said: Curse be upon the one who marries a divorced woman with the intention of making her lawful for her former husband and upon the one for whom she is made lawful.
Sunan Abi Dawud Book 12, Hadith 31
← Previous Hadith Al-Abbas ibn Abdullah ibn al-Abbas married his daughter to Abdur Rahman ibn al-Hakam, and AbdurRahman married his daughter to him. And they made this (exchange) their dower. Mu'awiyah wrote to Marwan commanding him to separate them. He wrote in his letter: This is the shighar which the Messenger of Allah (ﷺ) has forbidden.

Sunan Abi Dawud Book 12, Hadith 30 Next Hadith → The aforesaid tradition has also been transmitted by ‘Ali through a different chain of narrators from the Prophet (ﷺ) to the same effect.

Sunan Abi Dawud Book 12, Hadith 32