Except whom He has approved of messengers, and indeed, He sends before (72:27)

Almuntakhab Fi Tafsir Alquran Alkarim

Except to a Messenger whom He chooses and then He besets him on all sides with guardian angels to protect him and protect the Book with which He has put him in trust

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

(72:27) other than to a Messenger whom He chooses *27 (for the bestowal of any part of the knowledge of the Unseen), whereafter He appoints guards who go before him and behind him, *28

Except whom He has approved of messengers, and indeed, He sends before meaning

*27) That is, the Messenger by himself is no knower of the unseen, but when AIIah chooses him to perform the mission of Prophethood, He grants him the knowledge of those of the unseen truths which He is pleased to grant.
*28) "Guards": Angels. That is, when Allah sends down the knowledge of the unseen realities to the Messenger by revelation, He appoints angels on every side to safeguard it so that the knowledge reaches the Messenger in a safe condition, free from every kind of adulteration. This is the same thing which has been expressed in vv. 8-9 above, saying: After the appointment of the Holy Messenger the jinn found that all the doors to the heavens had been closed, and they noticed that strict security measures had been adopted because of which no room had been left for them to eavesdrop.
 

Except whom He has approved of messengers, and indeed, He sends before meaning in Urdu

سوائے اُس رسول کے جسے اُس نے (غیب کا کوئی علم دینے کے لیے) پسند کر لیا ہو، تو اُس کے آگے اور پیچھے وہ محافظ لگا دیتا ہے