And there has already come to them of information that in which (54:4)

﴿وَلَقَدْ جَاءَهُم مِّنَ الْأَنبَاءِ مَا فِيهِ مُزْدَجَرٌ﴾
[ القمر: 4]

54:4 And there has already come to them of information that in which there is deterrence -

There has come to them reports of the nations that Allah destroyed because of their disbelief and wrongdoing that were sufficient to deter them from their disbelief and wrongdoing.

And indeed there has come to them news (in this Quran) wherein there is (enough warning) to check (them from evil),

phonetic Transliteration

Walaqad jaahum mina alanbai ma feehi muzdajarun

Abdullah Yusuf Ali - Translation

There have already come to them Recitals wherein there is (enough) to check (them),

Safi-ur-Rahman al-Mubarakpuri

And indeed there has come to them news wherein there is Muzdajar.

Page 528 English transliteration