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allāhu lā ʾilāha ʾillā huwa la-yajmaʿannakum ʾilā yawmi l-qiyāmati lā rayba fīhi wa-man ʾaṣdaqu mina llāhi ḥadīthan
Allah—there is no god except Him—will surely gather you on the Day of Resurrection, in which there is no doubt; and who is more truthful in speech than Allah?
— Ali Quli Qarai
Surah An-Nisa', Verse 87
87. "Allah, there is no god but He. He will certainly gather you all together on the Day of Resurrection. There is no doubt in it; and who is more true in word than Allah?
Either of Unity and Resurrection relates to each other.
The Day of Resurrection is a day of gathering for all to be taken account of. Therefore, we should try alongside His path, and we must worship Him alone. There is no doubt in the Hereafter after those many evidences for Resurrection. (Such as: 'Divine Justice, Wisdom, the signs of resurrection in the nature and its new life in the spring after the concerning death in the winter.) In this regard, it says:
Then, in the conclusion of the verse, to emphasize the subject, it says: