Thus His words—exalted is He—
“He does not disclose His unseen to anyone” ⦗72:26⦘
make it plain that this is a realm of the unseen that belongs exclusively to Him; no one can know it except through Him. It is therefore unlike matters that may be hidden from some people yet known to others, for those can be learned from one another.

Among the questions the People of the Book in Madinah put to him were issues different from those he had been asked about while he was still in Mecca. The idolaters of Quraysh would send to the Jews of Madinah, asking them about Muhammad, and the Jews would reply with questions by which they hoped to test his prophethood.

This is exemplified by the report in Sahih al-Bukhari from Anas, who said: “Abdullah ibn Salam came to the Messenger of Allah—may Allah bless him and grant him peace—upon his arrival…"