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wa-mā kāna li-nabiyyin ʾan yaghulla wa-man yaghlul yaʾti bi-mā ghalla yawma l-qiyāmati thumma tuwaffā kullu nafsin mā kasabat wa-hum lā yuẓlamūna
A prophet may not breach his trust, and whoever breaches his trust will bring his breaches on the Day of Resurrection; then every soul shall be recompensed fully for what it has earned, and they will not be wronged.
— Ali Quli Qarai
Surah 'Ali-Imran, Verse 161
161. "And it is not for any prophet to defraud and whoever defrauds shall bring along what he has defrauded on the Day of Resurrection. Then everyone will be repaid for whatever he has earned, and they will not be dealt with unjustly."
This verse, may be as an answer that refers to those who, for the sake of gathering spoils of war, left the protective zone in 'Uhud. Imagining that they would not be deprived from their booty shares, they ignored the warnings of their commander who said that their share was preserved and it would not be far from the view of the Messenger of Allah (S).
Explanations
1. Prophets have always been trustworthy. The one, who wants to train some trustworthy persons, must not himself be treacherous. (Unfortunately, today, there are many treacherous figures among the non-heavenly leaders).
2. Not all the companions had enough Faith. Some of them were so that who might prove treacherous actions unto the Messenger of Allah (S).
3. None is safe from the suspicion of people.
4. Taking the property of others today (in this world) and returning them on that Day (in the Hereafter) is a kind of punishment. And, what a grievous state is that, that a person be brought with the wealth he had proved treacherous in before Prophets, martyrs and all human beings on the Day of Judgment.
Fraud; deceit, usurpation and treachery are from among the instances of /qall/ 'defraud'. At the time of the Prophet (S), it happened that the man who was in charge of collecting alms came to the Messenger of Allah (S) and said:
"This quantity of wealth have collected is alms and belongs to you, and this separate quantity is the gifts of people to myself."
Then, the Prophet (S) went up the pulpit and asked the audience:
'If this person remained at home, would any one give him a gift ? By Allah he will be raised in Hereafter with these unlawful properties.'
5. Remembrance of Hereafter restrains a person from treachery-
6. Allah is just. (He both gives the reward completely and never goes to extremes, even for a dot).
7. Defend the rights of pure servants and the saints of Allah.
8. The weakness of faith, from one side, and the love of the world, from another side, set men to suspect against the prophets.
9. Hereafter is a scene where the righteous will bring their good deeds and the treacherous ones will bring their own treacheries:
10. The rank of prophet hood never fits with treachery.