大般涅槃經義記 6.281

6.281

佛光照中，初許為王久住於世，後以光照。前中有二：一佛見世王悶絕躄地，許為住世至無量劫；二問答辯釋。

In the Buddha's illumination with light, he first promises to dwell long in the world for the king's sake, and later illuminates him with light. The former part has two sections: first, the Buddha sees the king fainting away and falling to the ground, and promises to remain in the world for incalculable kalpas; second, explanation through question and answer.