And the first of them will say to the last of them, (7:39)

Almuntakhab Fi Tafsir Alquran Alkarim

Then says the former to the latter: You lacked intellectual, moral and spiritual perception and therefore you were not of advantage to us but we were both entangled in one party defiled with sin. There, Allah says: you have well deserved the torment in requital of what your minds and souls had impelled you to do

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(7:39) Then the preceding ones will say to the succeeding ones: 'You were in no way superior to us; taste, then, this torment for your deeds.'  *31

And the first of them will say to the last of them, meaning

*31). In addition to the above verse, the Qur'an elsewhere recounts the mutual incriminations of the dwellers of Hell. For example, it occurs in Sarah al-Saba' in the following words: 'Could you but see when the wrong-doers will be made to stand before their Lord, throwing back the word (of blame) on one another! Those who had been abased will say to the arrogant ones: "Had it not been for you, we should certainly have been believers!" The arrogant ones will say, to those who had been abased: "Was it we who kept you back from Guidance after it reached you? Nay, rather it was you yourselves who transgressed" ' (al-Saba' 34: 31-2). This means that since the misguided people themselves were not keen on receiving the right guidance, they fell victims even more to the forces of misguidance. Out of their own excessive worldliness they chose to follow their ungodly leaders. Granted that it was the forces of misguidance which had invented ideologies such as materialism, excessive worldliness, and nationalism. But when people were attracted to these false ideologies, they did so out of their own weaknesses. These forces of evil achieved success because what they offered was to the utmost liking of the people. Again, the people who were tempted to embrace counterfeit religious ideologies were themselves to blame for falling prey to them since there was an inner urge in them to accept such ideologies. Rather than submitting to the One True God and to rigorous moral discipline, they looked for deities that would help them to achieve their worldly purposes. Naturally, they invented deities of their own liking. They also desired the intercession of those who would let them grow in worldiness and godlessness, and yet who would also ensure their redemption in the Next World. As they preferred a religion that would not make their life a bit dry, permissive religious cults which did not object to any kind of self-indulgence were developed. This establishes clearly that the external forces of evil alone are not to blame. The people who succumb to evil and error equally share the blame. This neither condones the role of those who seek to mislead others, nor detracts from the responsibility of those who choose to be misled.
 

And the first of them will say to the last of them, meaning in Urdu

اور پہلا گروہ دوسرے گروہ سے کہے گا کہ (اگر ہم قابل الزام تھے) تو تمہی کو ہم پر کونسی فضیلت حاصل تھی، اب اپنی کمائی کے نتیجہ میں عذاب کا مزا چکھو