United Democratic Movement MP Nqabayomzi Kwankwa informed MPs of the threat, reading out the SMS message the journalist received.
"Traitors protecting your white friends in Parliament who started this, telling lies about your comrades. You are warned, we don't kill blacks but sit and watch the blood flow," the SMS said, according to Kwankwa.
The journalist was not identified.
On Monday journalists Thembeka Gqubule, Krivani Pillay, Lukhanyo Calata and Vuyo Mvoko gave harrowing testimony about Hlaudi Motsoeneng, the man who went from an ordinary producer for a Free State current affairs show to top management at the broadcaster.