"And fear a day when no soul shall avail another soul at all," meaning: it shall not benefit it.
Muhammad said: It is said: "Jaza 'anni fulan" (so-and-so took my place), without a hamza; meaning: he substituted for me. And "ajza'ani" (it sufficed me): it was enough for me. "Nor shall intercession be accepted from it," meaning: intercession shall not be except for the believers. "Nor shall any compensation be taken"
﴿وَاتَّقُوا يَوْمًا لَا تَجْزِي نَفْسٌ عَن نفس شَيْئا﴾ أَي: لَا تغني.
قَالَ مُحَمَّد: يُقَال: جَزَى عني فلَان، بِلَا همز؛ أَي: نَاب عني، وأجزأني: كفاني. ﴿وَلا يُقْبَلُ مِنْهَا شَفَاعَةٌ﴾ أَي: لَا تكون الشَّفَاعَة إِلَّا للْمُؤْمِنين (وَلا يُؤْخَذُ