I swear by the star when it goes down.

Nay! I swear by this city.

But nay! I swear by that which you see, / And that which you do not see.

They swear to you by Allah that they might please you and, Allah, as well as His Apostle, has a greater right that they should please Him, if they are believers.

Surely those who swear allegiance to you do but swear allegiance to Allah; the hand of Allah is above their hands. Therefore whoever breaks (his faith), he breaks it only to the injury of his own soul, and whoever fulfills what he has covenanted with Allah, He will grant him a mighty reward.

And they swear by Allah with the most energetic of their oaths that if you command them they would certainly go forth. Say: Swear not; reasonable obedience (is desired); surely Allah is aware of what you do.