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Shaqi (wretched) and Said (blessed) have become almost technical theological terms. They are explained in the four following verses.
Speak i.e., either in self-defence or in accusation of others or to intercede for others, or to enter into conversation or ask questions, one with another. It will be a solemn Day, before the Great Judge of all, to whom everything will be known and whose authority will be unquestioned. There will be no room for quibbling or equivocation or subterfuge of any kind, nor can any one lay the blame on another or take the responsibility of another. Personal responsibility will be enforced strictly.