مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1520
Musnad Abu Ishaq Sa'd bin Abi Waqqas
It was narrated from ‘Amir bin Sa"d bin Abi Waqqas that his father said: The Messenger of Allah (ﷺ) said: “One of those who commit the greatest offence against the Muslims is a man who asks about something and persists in asking about it until a prohibition is revealed concerning it because of his asking.”
Musnad Ahmad 1520lts isnad is Sahih, al-Bukhari (7289) and Muslim (2358)]