Al-A'laa • BN-TAFSEER-IBN-E-KASEER
﴿ إِنَّ هَٰذَا لَفِى ٱلصُّحُفِ ٱلْأُولَىٰ ﴾
“Verily, [all] this has indeed been [said] in the earlier revelations –”
Please check ayah 87:19 for complete tafsir.