Some Foods Were Made Unlawful for the Jews Because of their Injustice and Wrongdoing
Allah says;
فَبِظُلْمٍ مِّنَ الَّذِينَ هَادُواْ حَرَّمْنَا عَلَيْهِمْ طَيِّبَاتٍ أُحِلَّتْ لَهُمْ
وَبِصَدِّهِمْ عَن سَبِيلِ اللّهِ كَثِيرًا
For the wrongdoing of the Jews, We made unlawful for them certain good foods which had been lawful for them ـ and for their hindering many from Allah's way;
Allah states that because of the injustice and transgression of the Jews, demonstrated by committing major sins, He prohibited some of the lawful, pure things which were previously allowed for them.
This prohibition could be only that of decree, meaning that Allah allowed the Jews to falsely interpret their Book and change and alter the information about what was allowed for them. They thus, out of exaggeration and extremism in the religion, prohibited some things for themselves.
It could also mean that in the Tawrah, Allah prohibited things that were allowed for them before.
Allah said,
كُلُّ الطَّعَامِ كَانَ حِـلًّ لِّبَنِى إِسْرَءِيلَ إِلاَّ مَا حَرَّمَ إِسْرَءِيلُ عَلَى نَفْسِهِ مِن قَبْلِ أَن تُنَزَّلَ التَّوْرَاةُ
All food was lawful to the Children of Israel, except what Israil made unlawful for himself before the Tawrah was revealed. (3;93)
We mentioned this Ayah before, which means that all types of food were allowed for the Children of Israel before the Tawrah was revealed, except the camel's meat and milk that Israil prohibited for himself. Later, Allah prohibited many things in the Tawrah. Allah said in Surah Al-An`am (chapter 6),
وَعَلَى الَّذِينَ هَادُواْ حَرَّمْنَا كُلَّ ذِى ظُفُرٍ وَمِنَ الْبَقَرِ وَالْغَنَمِ حَرَّمْنَا عَلَيْهِمْ شُحُومَهُمَأ إِلاَّ مَا حَمَلَتْ ظُهُورُهُمَأ أَوِ الْحَوَايَأ أَوْ مَا اخْتَلَطَ بِعَظْمٍ ذَلِكَ جَزَيْنَـهُم بِبَغْيِهِمْ وِإِنَّا لَصَـدِقُونَ
And unto those who are Jews, We forbade every (animal) with undivided hoof, and We forbade them the fat of the ox and the sheep except what adheres to their backs or their entrails, or is mixed up with a bone. Thus We recompensed them for their rebellion. And verily, We are Truthful. (6;146)
This means, We prohibited these things for them because they deserved it due to their transgression, injustice, defying their Messenger and disputing with him.
So Allah said;
فَبِظُلْمٍ مِّنَ الَّذِينَ هَادُواْ حَرَّمْنَا عَلَيْهِمْ طَيِّبَاتٍ أُحِلَّتْ لَهُمْ
وَبِصَدِّهِمْ عَن سَبِيلِ اللّهِ كَثِيرًا
For the wrongdoing of the Jews, We made unlawful to them certain good foods which had been lawful to them, and for their hindering many from Allah's way.
This Ayah states that they hindered themselves and others from following the truth, and this is the behavior that they brought from the past to the present.
This is why they were and still are the enemies of the Messengers, killing many of the Prophets. They also denied Muhammad and `Isa, peace be upon them.
Allah said