He knows what is [presently] before them and what will be after (21:28)

Almuntakhab Fi Tafsir Alquran Alkarim

He knows all that is before them and all that is behind them and they never intercede on behalf of anyone except on behalf of those approved by Him, those to whom He intends to be gracious. The angels- keep in awe of Him on account of the deep veneration and the profound reverence dutiful to Him

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

(21:28) He knows whatever is before them and also whatever is hidden from them; they "do not intercede for anyone except for the one for whom Allah pleases to hear a plea, and they live in awe of Him *27

He knows what is [presently] before them and what will be after meaning

*27) These two verses refute the two reasons for which the mushriks had made the angels their deities:
(1) They took them for the offspring of Allah.
(2) They thought that if they worshipped the angels, they would be so pleased that they would intercede with Allah on their behalf. (See X:18; XXXIX:3).
In this connection, it should also be noted that the Qur'an refutes the doctrine of intercession of the mushriks, saying, that their so-called intercessors are not qualified to intercede for anyone. This is so' because they have no knowledge of the hidden things, whereas Allah knows all that is hidden from or open to them. Therefore, the angels or Prophets or saints shall be allowed intercession only with the prior permission of Allah. As Allah alone has the power to hear or accept intercession, none else is entitled to divine worship or rights. For further details, please sec Ta Ha (XX): E. N.'s 85-86.
 

He knows what is [presently] before them and what will be after meaning in Urdu

جو کچھ اُن کے سامنے ہے اسے بھی وہ جانتا ہے اور جو کچھ اُن سے اوجھل ہے اس سے بھی وہ باخبر ہے وہ کسی کی سفارش نہیں کرتے بجز اُس کے جس کے حق میں سفارش سننے پر اللہ راضی ہو، اور وہ اس کے خوف سے ڈرے رہتے ہیں