Overall meaning : Allah, Exalted be He, says: Do not use the oaths you take as a means of deceiving those to whom you swear them so that they will believe you, lest your foot should slip from the faith after having been set firmly upon it, and then you will taste punishment in this life for turning others away from this religion because of your treachery, and you will suffer a grievous punishment in the life to come. Do not break the covenants which you have confirmed by taking an oath in Allah’s name, thereby seeking the fleeting gains of the present, worldly life. The reward Allah has in store for those who honour their covenants is far better than such trifling gains, if you only knew the real difference between the transient worldly life and the everlasting life to come.
Allah Almighty then makes them desirous to do what is pleasing to Him: Whatever transitory worldly goods that you have will certainly come to an end, but whatever rewards that Allah has are everlasting; We will certainly repay those who are persevering and patient in fulfilling Allah’s commandments, refraining from sins and all the adversities in Allah’s cause according to the best of the good deeds they have done, and We will surely pardon their misdeeds.
After that, the Almighty shows the best outcome of the believers who strive hard to do righteous deeds: To those who do good deeds, male or female, while believing in Allah and His Messenger, We will surely give a good, happy life; and We will certainly reward them according to the best goods deeds they have done in the life of the world.