Mujahid bin Jabr said, "The Jews told Quraysh to say this to Muhammad , then Allah said: `Did they not disbelieve in that which was given to Musa of old They say: Two kinds of magic, each helping the other!' This refers to Musa and Harun, may the peace and blessings of Allah be upon them both,

[تَظَـهَرَا]

(each helping the other) i.e., working together and supporting one another.'' This was also the view of Sa`id bin Jubayr and Abu Razin that the phrase "two kinds of magic'' referred to Musa and Harun. This is a good suggestion. And Allah knows best.