Redford says the stadium was where Mandela often held rallies and gave speeches as he took the nation out of its apartheid years.
She says it is sad to know he will never take that stage again.
Redford worked with Mandela in the early 1990s as he developed a new political system for South Africa.
The premier says the service was sadness mixed with joy.
She says the crowd was particularly excited to hear U.S. President Barack Obama call Mandela one of the leaders that put him on the path to politics and eventually to the White House.
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