Allah said to the Prophet: [Say: perhaps some of it may have followed you]. Qatada said: Meaning, it has drawn near to you.
Muhammad said: (Radifa lakum), the 'lam' in it is superfluous according to the linguists; the meaning is: it followed you, just as you say: 'rakibakum' (it rode you/followed you closely), and it came after you. [Some of that which you hasten], Al-Hasan said: Meaning, the establishment of the Hour by which the last of the disbelievers of this nation will be destroyed.
قَالَ اللَّهُ للنَّبِيِّ: ﴿قُلْ عَسَى أَن يكون ردف لكم﴾ قَالَ قَتَادَةُ: يَعْنِي: اقْتَرَبَ مِنْكُمْ.
قَالَ مُحَمَّد: (ردف لكم) اللَّامُ فِيهِ زَائِدَةٌ عِنْدَ أَهْلِ اللُّغَةِ؛ الْمَعْنَى: رَدِفَكُمْ؛ كَمَا تَقُولُ: رَكِبَكُمْ، وَجَاءَ بَعْدَكُمْ. ﴿بَعْضُ الَّذِي تَسْتَعْجِلُون﴾ قَالَ الْحَسَنُ: يَعْنِي: قِيَامَ السَّاعَةِ الَّذِي يُهْلَكُ بِهِ آخِرُ كُفَّارِ هَذِه الآمة