Translation of the verse 42 from Surah Al-Qalam : Number of verses 52 - - page 565 - Part 29.
(Remember) the Day when the Shin shall be laid bare (i.e. the Day of Resurrection) and they shall be called to prostrate (to Allah), but they (hypocrites) shall not be able to do so,
The Day the shin will be uncovered and they are invited to prostration but the disbelievers will not be able,
(68:42) On the Day when the dreadful calamity will unfold, *24 when people will be summoned to prostrate themselves, and yet they will not be able to prostrate.
*24) Literally: "The Day the shin shall be uncovered". A section of the Companions and their successors says that these words have been used idiomatically, for according to Arabic idiom, kashf-i saq implies befalling of an affliction. Hadrat `Abdullah bin 'Abbas also has given this same meaning of this and has supported it by evidence from Arabic poetry. According to another saying that has been cited from Ibn 'Abbas and Rabi' bin Anas, kashf-i saq implies uncovering the facts and truths. In view of this interpretation, the meaning would be: "The Day when all truths shall be bared and the people's deeds shall become open and manifest. "