Allah is He Who raised the heavens without any pillars that you see, and He is firm in power and He made the sun and the moon subservient (to you); each one pursues its course to an appointed time; He regulates the affair, making clear the signs that you may be certain of meeting your Lord.

He said: My Lord! give me a sign. He said: Your sign is that you will not be able to speak to the people three nights while in sound health.