They have made their oaths a shield, and obstruct people from the way of God. There is shameful punishment for them.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (they make a shelter of their oaths) they lie in their oath in order not to be killed (and turn (men) from the way of allah) they secretly turn people away from allah's religion and obedience; (so theirs will be a shameful doom) with which they will be humiliated in the hereafter.
Jalāl al-Dīn al-Maḥallī
تفسير : they have taken their oaths as a shield, a [means of] protection for themselves and their possessions, and so they bar, thereby the believers, from the way of god, that is, from engaging in a struggle against them, thereby slaying them and seizing their possessions. so for them there will be a humiliating chastisement.