Tafsir of Al-Mujadilah 58:16

اتخذوا أيمانهم جنة فصدوا عن سبيل الله

They have made their oaths a screen. Thus they hinder (others) from the path of Allah, meaning, the hypocrites pretended to be believers and concealed disbelief under the shield of their false oaths. Many were unaware of their true stance and were thus deceived by their oaths. Because of this, some people were hindered from the Path of Allah

فلهم عذاب مهين

so they shall have a humiliating torment. meaning, as recompense for belittling the significance of swearing by the Mighty Name of Allah, while lying and concealing betrayal. Allah the Exalted said,