The command of Allah is coming, so be not impatient for it. (16:1)

Almuntakhab Fi Tafsir Alquran Alkarim

Allahs decree is inevitably coming to pass and so you Pagans need not reproach the Messenger for divine visitation in a sarcastic and insulting way. How foolish of you to cut off your last hope of forgiveness by wishing scornfully that it, be hastened on; glory be to Him and extolled are His glorious attributes; He is infinitely far beyond those whom they incorporate with Him

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

(16:1) Allah's "Judgment" has come: *1 so do not clamour for hastening it; He is free from every defect, and exalted high above the shirk that they are practising. *2

The command of Allah is coming, so be not impatient for it. meaning

*1) That is, "The time for final `Judgment' has come near." As regards the use of the past tense in the original, this may be to show certainty of its occurrence in the near future or to emphasize the fact that the rebellion and the wrong deeds of the Quraish had become so unbearable that they warranted that the time for decisive action had come.
Here question arises as to what that "Judgment" was and how it came. We are of the opinion (and true knowledge is with Allah alone) that that "Judgment" was Hijrat (the Migration) of the Holy Prophet from Makkah. For a short time after this Revelation he was bidden to emigrate from there. And according to the Qur'an, a Prophet is bidden to leave his place only at that time when the rebellion and antagonism of his people reaches the extreme limit. Then their doom is sealed, for after this Allah's punishment comes on them either as a direct scourge from Him, or they are destroyed by the Prophet and his followers. And this did take place actually. At the occasion of the Migration, the people of Makkah regarded it as a victory for themselves, but in fact it turned out to be a defeat for shirk and disbelief which were totally uprooted within a decade or so after the Migration not only from Makkah but from the rest of Arabia as well.
*2) In order to understand the interconnection between the first and the second sentences, one should keep in view the background. The challenge of the disbelievers to the Prophet, `to hasten Divine Judgment',was really based on their assumption that their own religion of shirk was true and the religion of Tauhid presented by Muhammad (Allah's peace be on him) was false; otherwise, they argued, the Divine scourge with which he threatened them would have come upon them long before because of their disbelief and rebellion, if there had been the authority of Allah behind it. That is why after the declaration of the "Judgment," their misunderstanding about the cause of delay in the punishment was removed, as if to say, "You arc absolutely wrong to assume that punishment has not been inflicted on you because your creed of shirk is true, for AIlah is fret from and far above shirk and has no partner" .
 

The command of Allah is coming, so be not impatient for it. meaning in Urdu

آ گیا اللہ کا فیصلہ، اب اس کے لیے جلدی نہ مچاؤ پاک ہے وہ اور بالا تر ہے اُس شرک سے جو یہ لوگ کر رہے ہیں