The MEE report cited two government sources and one male relative of the accused. They identified the three individuals as Sheikh Salman al-Awdah, Awad al-Qarni and Ali al-Omari.
According to the report, the three scholars will be executed by the Saudi authorities after the holy month of Ramadan.
The Saudi authorities have not issued a statement regarding these claims.
Al-Awdah is an internationally renowned progressive Islamic scholar described by UN experts as a "reformist", al-Qarni is a preacher, academic and author, and al-Omari is a popular broadcaster.
"They will not wait to execute these men once the death sentence has been passed," one unnamed source told Middle East Eye.
Saudi Arabia has already executed dozens of people this year, including 37 last month. These executions caused an international outcry from several human rights groups as the Saudi authorities put to death several democracy advocates.