7:167 wa idh ta-adh-dhana rab-buka la yab’Athan-na ‘Alayhim ilaa yawmil qiyaamati may yasuumuhum suu-al ‘Adhaab* in-na rab-baka la sariy’Ul ‘Iqaab* wa in-nahuu la gafuurur raHiym

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Ahmed Raza Khan: Mohammed Aqib Qadri:
And remember when your Lord announced the command that till the Day of Resurrection I will certainly send such oppressors against them, who will inflict them with a dreadful punishment; indeed your Lord is swift in meting out punishment; and indeed He is Oft Forgiving, Most Merciful.

Yusuf Ali:
Behold! thy Lord did declare that He would send against them, to the Day of Judgment, those who would afflict them with grievous penalty. Thy Lord is quick in retribution, but He is also Oft-forgiving, Most Merciful.

Pickthal:
And (remember) when thy Lord proclaimed that He would raise against them till the Day of Resurrection those who would lay on them a cruel torment. Lo! verily thy Lord is swift in prosecution and lo! verily He is Forgiving, Merciful.