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Lit., "become level with them". The term "the apostle" is probably used here in its generic sense, and refers to all the apostles who preached God's message at one time or another.
Prophet Muḥammad (ﷺ) asked one of his companions, ’Abdullah ibn Mas’ûd, to recite some verses of the Quran for him because he loved to hear it from someone other than himself. ’Abdullah recited from the beginning of this sûrah until he reached verse 42. When he was told he may stop, ’Abdullah said he looked at the face of Prophet (ﷺ) and saw tears rolling down his cheeks.
Those who reject Allah's message will wish, when their eyes are opened, that they were reduced to dust, for existence itself will be agony to them. They might like to hide in the dust, but nothing is hidden from Allah. All their past will stand out clear before Him.