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A reference to the terms in which Moses was to - and apparently did - announce his mission (see verse {16} above).
Moses having eliminated all personalities, the argument now comes up to the highest plane of all,-the attributes of Allah and His mercies. Moses had put forward this before, as implied in verse 16 above, but Pharaoh had twisted it into personalities. Now we come back to the real issue. It may have been in the same sitting, or it may have been in a later sitting.