Tafsir of Al-Mulk 67:4

ثم ارجع البصر كرتين

Then look again and yet again, Qatadah said, "It means (look) twice.''

ينقلب إليك البصر خاسٲ

your sight will return to you Khasi', Ibn `Abbas said that Khasi' means humiliated. Mujahid and Qatadah both said that it means despised.

وهو حسير

and worn out. Ibn `Abbas said that this means it will be exhausted. Mujahid, Qatadah and As-Suddi all said that it means broken down fatigue that comes from weakness. Thus, the Ayah means that if you continuously looked, no matter how much you look, your sight will return to you

خاسٲ

Khasi' due to the inability to see any flaw or defect (in Allah's creation)

وهو حسير

and worn out. meaning, exhausted and broken down feebleness due to the great amount of repeated looking without being able to detect any deficiency. Then, after Allah negated any deficiency in the creation of the heavens, He explains their perfection and beauty. He says,