The version narrated by Maslamah goes : He said: On that day we were almost equal in knowledge.
The version narrated by Isma'il says: Khalid said: I said to Abu Qilabah: where is the Qur'an(i.e. why did the Prophet (ﷺ) not say: The one who knows the Qur'an most should act as imam)? He replied: Both of them were equal in the knowledge of the Qur'an.
In-book : Book 2, Hadith 199
English translation : Book 2, Hadith 589