Rabada was fined 15% of his match fee and handed one demerit point for his overzealous celebration when dismissing England captain Joe Root on Thursday evening.
The seamer screamed next to the England skipper after bowling him for 27 in Port Elizabeth.
The news was confirmed by the International Cricket Council (ICC) on Friday. That triggers a one-Test ban.
The South African bowler was found to have violated Article 2.5 of the code, which relates to "using language, actions or gestures which disparage or which could provoke an aggressive reaction from a batter upon his or her dismissal during an global match".
'Joker' Leads Packed Oscar Nominations List With 11
Some potential nominees included Greta Gerwig for Little Women and Lorene Scafaria for Hustlers . Previously, Greta Gerwig received an Academy Award nomination for her film Lady Bird .
United flight returns to Newark in flames
United Airlines officials confirmed the jet suffered a mechanical problem and had to return back to the airport . Passengers were re-booked on a later flight, arriving in Los Angeles around 5 a.m.
Federal Bureau of Investigation arrest former Canadian reservist, suspected neo-Nazi, in United States
The criminal case against Lemley, Bilbrough and Mathews was filed under seal Tuesday; it was unsealed today after their arrests. It's alleged all three are members of the racially motivated and violent extremist group The Base, the release says.
In what has been a relatively more dramatic session of play, South Africa picked up two scalps in the post Lunch period, and also almost accounted for the wicket of Joe Denly, to leave England at 117/2 at Tea on the opening day of the third Test. The 24-year-old accepted the censure and due to his previous indiscretions will now miss the fourth and final Test in Johannesburg next week.
In the past, Rabada has been punished for several incidents with India opening batsman Shikhar Dhawan and the Australian duo of Steve Smith and David Warner.
"He shouldn't be celebrating in a batsman's personal space", he said, adding Rabada had behaved in a similar way after dismissing Zak Crawley during the second Test in Cape Town.
Sibley fell soon after Lunch as he clipped a Kagiso Rabada delivery on the middle and legstump line to the fielder at backward short leg. Crawley, however, wasn't adventurous with his shot-making and managed to last more than an hour into the second session. England were in a spot of bother after losing three wickets for 35 runs to slip to 148 for 4 before Pope and Stokes steadied the ship.