He it is Who made the sun a shining brightness and the moon a light, and ordained for it mansions that you might know the computation of years and the reckoning. Allah did not create it but with truth; He makes the signs manifest for a people who

And We have made the night and the day two signs, then We have made the sign of the night to pass away and We have made the sign of the day manifest, so that you may seek grace from your Lord, and that you might know the numbering of years and the reckoning; and We have explained everything with distinctness.

So We prevented them from hearing in the cave for a number of years.

He will say: How many years did you tarry in the earth?

Until when they see what they are threatened with, then shall they know who is weaker in helpers and fewer in number.

So that He may know that they have truly delivered the messages of their Lord, and He encompasses what is with them and He records the number of all things.