Rabada took 5/96 and 6/54 in South Africa's six-wicket win that levelled the four-match series at 1-1, with two Tests remaining.
Proteas speedster and second-Test hero Kagiso Rabada ackowledges that he has let his team down as they prepare for the rest of their series against Australia without him. Rabada had proven to be by far the biggest threat to the batting line-up, grabbing 15 wickets in the first two Tests.
The International Cricket Council (ICC) rejected Rabada's claim the contact with Smith was accidental.
Compounding the loss of Rabada and Steyn is the fact Vernon Philander and Morne Morkel - the nation's two other most experienced bowlers - have combined to take just eight wickets at 37 in what has been a low-scoring series.
The only South African with more 10-wicket test hauls is 86-test veteran Dale Steyn, while the only Australians with more 10-wicket test hauls are Clarrie Grimmett (seven), Dennis Lillee (seven) and Shane Warne (10).
In another spiteful Test, Rabada was also found guilty of a level one misconduct offence when he gave Warner a send off in the second innings.
The first for making contact with Steve Smith's shoulder in the first innings after trapping him lbw and the second for giving Warner one of his now infamous sendoffs.
The void he will leave is monumental. His first breach came after an altercation with Sri Lanka's Niroshan Dickwella during an ODI at Cape Town previous year.
And Mitchell Marsh was guilty of the same offence after swearing at Rabada once he dismissed him on day four.
Australia's hopes of a miraculous turnaround weren't helped by a simple slips catch that Mitch Marsh put down, when the hosts were 7-0.
It was an error Australia could ill afford.
Aiden Markram had an escape in the second over of South Africa's chase.
He also screamed in the Aussie opener's face after taking his wicket. South Africa began the day clearly in the stronger position, but Australia were 41 runs ahead and still had five wickets in hand.
The 22-year-old pacer, exceptionally talented as he is, has a history of disciplinary issues.
Cricket South Africa (CSA) immediately announced they had 48 hours to appeal the decision and were seeking legal opinion.
"When people behave like that, you just wonder, why, why is that necessary?", Holding said.
Du Plessis had lavished praise on Rabada and AB de Villiers. "If I knew I did it deliberately I wouldn't have contested it", said Rabada.
"I think all the quicks are going really well".
It's the halfway point of the four-Test series between Australia and South Africa, but there's already been a spate of controversial incidents.
Reports in Spain have suggested Neymar wants a return to Barca, which players including Ivan Rakitic and Coutinho have welcomed.But coach Ernesto Valverde played down the speculation, describing it as a "fantasy".
But whichever way you look at it, it is Rabada's fault that he landed in that situation.
- Xi Jinping becomes China's 'president for life' as Parliament abolishes term limits
- Explosion as Palestinian PM enters Gaza
- Two with Texas ties among the dead in NYC helicopter crash
- Spring Statement 2018: OBR revises up GDP; Inflation to fall to 2%
- Meghan Markle laughs at Prince Harry during Commonwealth Day service
- Woods one back as Conners keeps Valspar lead
- France win over United Kingdom hands Ireland title
- Lions Were Reportedly One Of Four Finalists To Sign Richard Sherman
- Vikings closing in on Kirk Cousins: Quarterback visiting Minnesota
- Will the Fitbit Versa make you trade in your Apple Watch?