What is the authenticity of the hadith about the suckling of adults, which Aisha mentioned concerning Salim, the freed slave of Abu Hudhayfah, and what does the Prophet's (peace and blessings be upon him) command to suckle him mean?

The hadith is authentic and agreed upon. However, scholars have differed regarding its implication. Aisha and Dawud maintain that suckling establishes حرمة (prohibition of marriage) for an adult just as it does for a child, based on this hadith. In contrast, the majority of scholars, including the Companions, the Tabi'in, and scholars from various cities, hold the view that prohibitive suckling is only established for those under two years of age (with some minor exceptions in duration, such as Abu Hanifa, Zufar, and Malik). They base their argument on Allah's saying: "And mothers suckle their children for two full years," and on the hadith: "Suckling is only that which fills the stomach." They interpreted the hadith of Sahlah as being specific to her and Salim. It has also been narrated that Umm Salamah and all other wives of the Prophet, peace be upon him, disagreed with Aisha on this matter. Furthermore, it is possible that he was suckled in a manner that did not involve touching the breast. In conclusion, while the hadith is authentic, the majority of scholars believe that its ruling is specific to Salim and does not apply to others.