Former Audioslave guitarist Tom Morello has posted the cover photo of Black Sabbath’s ‘Mob Rules’ album on Instagram and mourned the 10th anniversary of Ronnie James Dio’s death.

In the caption, Morello told an untold story about Ronnie and his former bandmate from Audioslave, Chris Cornell, who passed away three years ago. In the story, Ronnie and Chris had an interesting argument, and we heard it for the first time ever.

Here’s what Tom stated:

“10 years since the passing of Ronnie James Dio, one of the all-time great rock singers, a kind man, and a proud & unapologetic proponent of heavy metal. 1. Love his work with Rainbow, Sabbath & his solo Dio albums. 2. Dio was practicing at the same rehearsal complex as Audioslave.

Brad & I would often press our ears to the door to listen. One day we all got to meet in the parking lot and the diminutive Dio and towering Cornell had a discussion. Dio said, ‘It’s not how big your pencil is, it’s how big you write your name.’ Chris then asked him if he had any advice. His reply, ‘never take shit from anybody!’ Rest In Peace, Ronnie. Gonna crank up some awesome Mob Rules today in your memory.”

A fan named Leigh Anne told another story about Dio in the comment section and said:

“One time at the WEM office we got a fax that Dio was selling stage sets from storage, including a knight in armor that shot lasers from his eyes \m/. I bet many 80s HS talent shows covered ‘Rainbow in the Dark’ because… Piano lessons. What a magnificent riff.”

You can see the Instagram post below.

View this post on Instagram

10 years since the passing of #RonnieJamesDio, one of the all time great rock singers, a kind man, and a proud & unapologetic proponent of heavy metal. 1. LOVE his work with Rainbow, Sabbath & his solo Dio albums. 2. Dio was practicing at the same rehearsal complex as Audioslave. Brad & I would often press our ears to the door to listen. One day we all got to meet in the parking lot and the diminutive Dio and towering Cornell had a discussion. Dio said, “It’s not how big your pencil is, it’s how big you write your name.” Chris then asked him if he had any advice. His reply, “NEVER take SHIT from ANYBODY!” Rest In Peace, Ronnie. Gonna crank up some awesome Mob Rules today in your memory.

A post shared by Tom Morello (@tommorello) on