We have certainly sent down to you a Book in which is (21:10)

Almuntakhab Fi Tafsir Alquran Alkarim

And We have sent down to you people a Book -the Quran- serving as a reminder to you in every respect and in due time will it praise your name to fame that you will be mentioned by others with admiration, adoration, and commendation; will you not understand

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(21:10) O people, We have sent down to you a Book, which deals with matters concerning yourselves. What, do you not understand this? *12

We have certainly sent down to you a Book in which is meaning

*12) This is a comprehensive answer to the various objections which were being raised in desperation by the disbelievers of Makkah against the Qur'an and the Holy Prophet, as if to say:"What is there in this Book that you cannot understand? Why don't you consider it in the right spirit? There is nothing contradictory in it: it discusses you and your own problems and affairs of life; it describes your own nature, origtn and end; it discriminates between good and evil and presents high moral qualities which your own consciences endorse and confirm. Why don't you, then, use your minds to understand this simple and easy thing?"
 

We have certainly sent down to you a Book in which is meaning in Urdu

لوگو، ہم نے تمہاری طرف ایک ایسی کتاب بھیجی ہے جس میں تمہارا ہی ذکر ہے، کیا تم سمجھتے نہیں ہو؟