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Only a fight in self-defence - in the widest meaning of this term - can be considered a "fight in God's cause" (see {2:190-194}, and the corresponding notes); and, thus, the particle "or" between these two phrases is almost synonymous with the expression "in other words".
This is an allusion to the three hundred men who, on the way from Medina to Mount Uhud, forsook the Prophet on the specious plea that he did not really intend to give battle (see note [90] above). But since they knew in their hearts that it would come to a fight, their defection from God's cause almost amounted to a denial of Him (kufr, here rendered as "apostasy").
The testing of the Hypocrites was the searching out of their motives and exposing them to the sight of their brethren, who might otherwise have been taken in. In the first place they gave counsels of caution: in their minds it was nothing but cowardice. In the second place, what they wished was not the good of the community but its being placed in a contemptible position. When others were for self-sacrifice, they were for ease and fair words. Pretending to be Muslims, they were nearer to Unbelief. Ironically they pretended to know nothing of fighting, and left their devout brethren to defend their faith and ideas. If that devout spirit did not appeal to them, they might at least have defended their city of Madinah when it was threatened,-defended their hearths and homes as good citizens.