If they are expelled, they will not leave with them, and if they are fought, they will not aid them. And [even] if they should aid them, they will surely turn their backs; then [thereafter] they will not be aided.
(Have you not observed the hypocrites who say to their friends among the People of the Scripture who disbelieve: "If you are expelled, we indeed will go out with you, and we shall never obey anyone against you; and if you are attacked, we shall indeed help you.") Allah then said,
All Muslims after the Muhajirin and the Ansar are entitled to fai'
وَالَّذِينَ جَاءُوا مِن بَعْدِهِمْ "And [ fai' is also ] for those who came after them ....59:10) This verse lays down that all Muslims until the Last Hour, after the noble Companions from amongst the Muhajirin and Ansar, are entitled to a share in the fai' property. This was the reason why Sayyidna ` Umar Al-Faruq ؓ conquered great territories like ` Iraq, Syria, Egypt and so on, but did not distribute them among the fighters. He retained them as public endowment for next generations, so that the income might accrue to the Islamic public treasury and the Muslims till the Last Hour may benefit from it. When some of the blessed Companions enquired about the distribution of the conquered territories, he referred to this verse and said: Had it not been for the future generations of Muslims, I would have distributed all the conquered territories among the fighters as they were captured, following the example of the Messenger of Allah ﷺ . When Khaibar was conquered, the Holy Prophet ﷺ distributed all its lands. If all the lands are distributed among the present Muslim generation, nothing will be left for future generations." [ Transmitted by Malik and Qurtubi ].
When the Prophet Muhammad announced the banishment of the Banu al-Nadir, the hypocrites ostensibly rallied to their side. They asked the Banu al-Nadir to take a firm stand and assured them of their support. But the hypocrites uttered these words just to incite them to rise against Muslims; they were never sincere in their offer. So, when the Muslims besieged the Banu al-Nadir, nobody came to help them. This has been the character of self-interested people in every age.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.