بَلْ بَدَا لَهُمْ مَّا كَانُوْا يُخْفُوْنَ مِنْ قَبْلُ ۗوَلَوْ رُدُّوْا لَعَادُوْا لِمَا نُهُوْا عَنْهُ وَاِنَّهُمْ لَكٰذِبُوْنَ ( الأنعام: ٢٨ )
Bal badaa lahum maa kaanoo yukhfoona min qablu wa law ruddoo la'aadoo limaa nuhoo 'anhu wa innahum lakaaziboon (al-ʾAnʿām 6:28)
But what they concealed before has [now] appeared to them. And even if they were returned, they would return to that which they were forbidden; and indeed, they are liars. (Al-An'am  : 28)
1 Mufti Taqi Usmani
In fact, what they were concealing earlier will become clear to them. If they were sent back, they would again go for what they were forbidden from, as they are sheer liars.