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Lit., "a liar". As regards my rendering of musaf as "one who wastes [or "has wasted"] his own self", see note [21] on the last sentence of 10:12 . Thus, the anonymous believer spoken of here argues that the message brought by Moses is so convincing that, by itself, it is a proof of his not being "one who wastes his own self" - i.e., destroys himself spiritually-by a spurious claim to divine inspiration.
Cf. the parable of the believer in {36:20-27} and, in particular, the corresponding note 15.
i.e., Moses (ﷺ).
A commonsense view is put before them by an Egyptian who loves his own people and does not wish them to perish in sin. "Will you kill this man for calling on Allah? Have you not seen his character and behaviour? Do you not see the 'Clear Signs' about him that bespeak his credentials? Suppose for a moment that he is a liar and pretender: he will suffer for his falsehood, but why should you turn against Allah? But suppose that he is really inspired by Allah to tell you the truth and warn you against evil, what will be your fate when Allah's Wrath descends? For it must descend if he is a true Messenger sent by Allah."
This is with reference to the "Clear signs". 'They are Signs of Allah's guidance, for Allah would never guide a man who exceeds the bounds of truth and tells you lies! Such a man is bound to be found out!'
There is nothing to justify the identification of this man with the man mentioned in xxviii. 20, who warned Moses long before Moses had received his mission. On the contrary, in this passage, the man is evidently speaking after Moses had received his mission, preached to Pharaoh, and got a certain amount of success, for which Pharaoh and his people were trying, to seek his life. Moses had evidently already brought his Clear Signs.