I asked Ibn Abbas about a thing concerning the throwing of stones at the jamrahs. He said: I do not know whether the Messenger of Allah ﷺ threw six or seven pebbles. (Using translation from Abū Dāʾūd 1977)
مَا أَدْرِي «رَمَاهَا رَسُولُ اللهِ ﷺ بِسِتٍّ أَوْ بِسَبْعٍ»