To what extent is the narration of Ka'b al-Ahbar sound, regarding Abu Hurayrah's knowledge of the Torah? What are the sayings of scholars concerning its authenticity and weakness? And how can one reconcile Abu Hurayrah's statement about the hour of Jumu'ah with the creation of the heavens and the earth in six days?

One must love the companions of the Prophet and be loyal to them, and despise those who show enmity towards them. It is not permissible to delve into their affairs with falsehood, for whoever doubts their uprightness doubts the religion itself. Abu Hurairah was a vessel of knowledge and a memorizer, and he narrated more [hadith] than any other companion. As for the statement attributed to Ka’b al-Ahbar: "I have not seen anyone who did not read the Torah more knowledgeable of what is in the Torah than Abu Hurairah," its chain of narration (isnad) is weak. Even if we assume its authenticity, its meaning is that Abu Hurairah would narrate to Ka’b from the Qur'an and Sunnah that which corresponded to what Ka’b had. And the phrase "did not read the Torah" indicates Abu Hurairah's lack of interest in the books of the People of the Book. The hadith about the creation of the universe on the days of the week, narrated by Muslim from Abu Hurairah, was authenticated by Muslim but others considered it flawed, stating that it was from the words of Ka’b and that the narrators confused it. If that is the case, Abu Hurairah might have taken the liberty of narrating it from Ka’b, and the error lies with the narrators. If the hadith is authentic, as Muslim believes, then there is no aspersion on it. The hadith of Abu Hurairah and Ka’b regarding Friday clarifies that Abu Hurairah did not accept every saying of Ka’b.