Is the story of Layla bint al-Ajmaa authentic, and is there evidence for conditional divorce in the Qur'an and Sunnah?

The story of Layla bint al-Ajmaa is authentic, and scholars have used it as evidence that whoever swears by divorce, not intending its occurrence but rather intending to prevent something or encourage something, then upon him is an expiation for an oath (kaffarat yameen), and the divorce does not take place. This is the madhhab of some Companions and Tabi'un, and it is the choice of Shaykh al-Islam Ibn Taymiyyah and those who agreed with him.

Ibn Taymiyyah and others have used the following points as evidence for this: 1. The hadith: "Indeed, actions are by intentions." Thus, a conditional divorce intended for encouragement or prevention does not take place because its occurrence was not intended. 2. A conditional divorce intended for encouragement or prevention is called an oath (yameen) in the Arabic language. Therefore, upon breaking it, what is due for an oath becomes due.

Ibn Taymiyyah mentioned that swearing by divorce was not common during the time of the Companions, and he had not received any report from them concerning it. He stated that the disagreement regarding it emerged during the time of the Tabi'un and those who came after them.