Translation:

4. To Him will be your return of all of you. The promise of Allah is true and sure. It is He Who beginneth the process of Creation and repeateth it that He may reward with justice those who believe and work righteousness but those who reject Him will have nothing but draughts of boiling fluids and a Penalty grievous: because they did reject Him.

Notes (Tafseer)

1388. Haqq: true, right, for just ends, in right proportions, sure and certain: all these ideas are implied.

1389. Cf. n. 120 to ii. 117. Allah's creation is not a simple act, once done and finished with. It is continuous, and there are many stages, not the least important of which is the Hereafter, when the fruits of our life will be achieved.

1390. Hamim: boiling fluid: it is associated as in xxxviii. 57, with gassaq, a dark, murky, or intensely cold fluid; both indicative of the grievous penalty that results from rebellion against Allah.