﴿ كِتَٰبٌ أَنزَلْنَٰهُ إِلَيْكَ مُبَٰرَكٌۭ لِّيَدَّبَّرُوٓا۟ ءَايَٰتِهِۦ وَلِيَتَذَكَّرَ أُو۟لُوا۟ ٱلْأَلْبَٰبِ ﴾

“[All this have We expounded in this] blessed divine writ which We have revealed unto thee, [O Muhammad,] so that men may ponder over its mes­sages, and that those who are endowed with insight may take them to heart.”

A Book kitābun the predicate of a missing subject namely hādhā ‘this is’ that We have revealed to you full of blessing that they may contemplate yaddabbarū is actually yatadabbarū but the tā’ has been assimilated with the dāl its signs that they may reflect upon its meanings and become believers and that they may remember that they may be admonished — those people of pith those possessors of intellect.