Tafseer Ibn Kathir of AR RA'D [25]

  (break the covenant of Allah, after its ratification, and sever that which Allah has commanded to be joined, and work mischief in the land,) An authentic Hadith states that,  

  (The signs of a hypocrite are three: Whenever he speaks, he tells a lie; whenever he promises, he always breaks it (his promise); if you entrust him, he proves to be dishonest.'') In another narration, the Prophet said,  

  (If he enters into a covenant, he betrays it; and if he disputes, he proves to be most quarrelsome.) This is why Allah said next,  

  (on them is the curse,) they will be cast away from Allah's mercy,  

  (and for them is the unhappy home. ) the evil end and destination,  

  (Their dwelling place will be Hell; and worst indeed is that place for rest.) ﴿13:18﴾