(Saba'a) 34 : 52
وَقَالُوا آمَنَّا بِهِ وَأَنَّىٰ لَهُمُ التَّنَاوُشُ مِنْ مَكَانٍ بَعِيدٍ
And they would say: Indeed we have believed with It; how could they attain It from a far place?
At the time of death and on Resurrection Day the disbelievers will say that we would become believers utilizing Adhikr if we get a chance. But through this verse, Allah is warning that there will not be any benefit by wailing at the time of death or from the Hereafter since the chance for repentance and to become a believer is closed by the death as explained in verses 4: 17-18. See explanation 23: 99-100; 32: 29; 41: 44.