Translation of the verse 8 from Surah Al-Ahzab : Number of verses 73 - - page 419 - Part 21.
That He may ask the truthfuls (Allah's Messengers and His Prophets) about their truth (i.e. the conveyance of Allah's Message that which they were charged with). And He has prepared for the disbelievers a painful torment (Hell-fire).
That He may question the truthful about their truth. And He has prepared for the disbelievers a painful punishment.
(33:8) so that (their Lord) may question the truthful about their truthfulness. *16 As for the unbelievers, He has kept a painful chastisement in store for them. *17
*16) That is, "Allah has not just taken the covenant but will also question as to how far it has been kept. Then only those who will have kept Allah's Covenant faithfully, will be declared to be the truthful. "
*17) To understand the theme of vv. 1-8 well these should be read together with vv. 36-41 of this Surah.