7th Ayah from Surah Al Buruj
And they, to what they were doing against the believers, were witnesses.
to watch what they were doing to the believers.
And they witnessed what they were doing against the believers (i.e. burning them).
and were watching what they were doing with the believers.
And were themselves the witnesses of what they did to the believers.
And they witnessed (all) that they were doing against the Believers.