The Quran

146

وَعَلَى الَّذينَ هادوا حَرَّمنا كُلَّ ذي ظُفُرٍ ۖ وَمِنَ البَقَرِ وَالغَنَمِ حَرَّمنا عَلَيهِم شُحومَهُما إِلّا ما حَمَلَت ظُهورُهُما أَوِ الحَوايا أَو مَا اختَلَطَ بِعَظمٍ ۚ ذٰلِكَ جَزَيناهُم بِبَغيِهِم ۖ وَإِنّا لَصادِقونَ

Muhammad Asad

And [only] unto those who followed the Jewish faith did We forbid all beasts that have claws;¹ and We forbade unto them the fat of both oxen and sheep, excepting that which is in their backs or entrails or that which is within the bone:² thus did We requite them for their evildoing - for, behold, We are true to Our word!"³

The construction of the above sentence makes it clear that this prohibition was imposed specifically on the Jews, to the exclusion of believers of later times (Razi).
Cf. Leviticus vii, 23 (where, however, "all manner" of fat of ox, sheep or goat is declared forbidden).
See 3:93.