What is the authenticity of the hadith of al-Jusasiyyah?

The questioner : May Allah reward you, O honorable Shaykh. What is the authenticity of the hadith of al-Jusasiyyah?

The Shaykh : Yes, the hadith of al-Jusasiyyah was narrated by Muslim, but some scholars criticized it because it contradicts what is established in the two Sahihs and others, that the Prophet (peace and blessings be upon him) said in the last part of his life: This hadith, or its meaning, is that after one hundred years, everyone currently existing on the face of the earth will have died. It is not those who will be created before his statement, nor those who will be created after his statement; they will remain, if Allah wills. But those who are with you now, all of them will die before the completion of one hundred years. At the completion of one hundred years, they said, and this is the most correct, and this is general. Some scholars authenticated it, stating that Muslim narrated it in his Sahih, and he answered regarding the instability mentioned in it and the strangeness mentioned in some of its wordings. And knowledge is with Allah.
If the Prophet (peace and blessings be upon him) reported it, then it is truth and veracity; otherwise, it is not established from him. The matter in it is with Allah the Mighty and Majestic.
As for Gog and Magog, may Allah bless you, they have existed from ancient times. For Allah related the story of Dhul-Qarnayn and what He said about him: But their story that will occur at the end of time has not yet come.