And when he mentioned what indicates resurrection, he followed it with what would be a cause of it, indicating that existence was created only for the purpose of resurrection, for it is the essence of wisdom: ﴿So when the﴾ that is, after death ﴿Great Catastrophe﴾ that is, the overwhelming calamity which rises above all other calamities and covers them, it will be the greatest calamity that exists, and it is the resurrection by the second blowing of the trumpet - as Ibn Abbas, may Allah be pleased with them both, said. The subject of 'when' is omitted, its meaning being: He will separate the people into the wretched and the happy.