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qul yā-ʾahla l-kitābi li-ma taṣuddūna ʿan sabīli llāhi man ʾāmana tabghūnahā ʿiwajan wa-ʾantum shuhadāʾu wa-mā llāhu bi-ghāfilin ʿammā taʿmalūna
Say, ‘O People of the Book! why do you bar the faithful from the way of Allah, seeking to make it crooked, while you are witnesses [to its truthfulness]? And Allah is not oblivious of what you do.’
— Ali Quli Qarai
Surah 'Ali-Imran, Verse 99
99. "Say: ' O' People of the Book! Why do you obstacle those who believe from the way of Allah seeking to make it crooked, while you are witnesses? But Allah is not heedless of what you do? "
In the previous verse the question was about the infidelity of the People of the Book. In this holy verse, besides criticizing against their former behaviour, they are questioned if they do not believe themselves and disbelieve in the Signs of Allah; by what reason they hinder others to pave the path of Allah. But they should know that Allah is never heedless of what they do.
Explanations
1. Your enemies always try to pervert you from the Truth.
2. Your enemies know and are witnesses to your rightfulness.
3. The enemies of Islam might know that Allah is aware of their deeds and is lying in wait for them.
4. If we know that ourselves and our conduct are not overlooked, even for a moment, we may leave wrong doing.