Verily, you will die, and verily, they (too) will die.
This is one of the Ayat which Abu Bakr As-Siddiq, may Allah be pleased with him, quoted when the Messenger of Allah died, so that the people would realize that he had really died.
Another Ayah which he quoted was;
وَمَا مُحَمَّدٌ إِلاَّ رَسُولٌ قَدْ خَلَتْ مِن قَبْلِهِ الرُّسُلُ أَفإِيْن مَّاتَ أَوْ قُتِلَ انقَلَبْتُمْ عَلَى أَعْقَـبِكُمْ وَمَن يَنقَلِبْ عَلَى عَقِبَيْهِ فَلَن يَضُرَّ اللَّهَ شَيْياً وَسَيَجْزِى اللَّهُ الشَّـكِرِينَ
Muhammad is no more than a Messenger, and indeed (many) Messengers have passed away before him. If he dies or is killed, will you then turn back on your heels? And he who turns back on his heels, not the least harm will do to Allah; and Allah will give reward to those who are grateful. (3;144)
The meaning of this Ayah is that you will certainly depart this world and be gathered before Allah in the Hereafter. You will dispute the issues of Tawhid and Shirk before Allah, things over which you disputed in this world, and He will judge between you with truth, and He is the Judge, the All-Knowing. So, He will save the sincere believers who worship Him alone, and He will punish the disbelievers who deny His Oneness and associate others in worship with Him.
Although this Ayah speaks about the believers and disbelievers, and how they will dispute in the Hereafter, it also includes all disputants in this world, for their disputes will come back to them in the Hereafter.
Ibn Abi Hatim, may Allah have mercy on him, recorded that Ibn Az-Zubayr, may Allah be pleased with him, said,
"When the Ayah
ثُمَّ إِنَّكُمْ يَوْمَ الْقِيَامَةِ عِندَ رَبِّكُمْ تَخْتَصِمُونَ