"But you will see those in whose hearts is disease hastening towards them...
"But you will see those in whose hearts is disease hastening towards them, saying: We fear lest a calamity should befall us.' And it may be that Allah brings about a victory or (some) thing from Himself (for the benefit of Muslims), then they will be regretting for what they hid in their selves." In this verse, the Holy Qur'an points to the pretexts that some sickly people chose for justification of their unlawful relations with the non-Muslim foreigners.
The verse implies that those in whose hearts there is sickness persist to take them as their own refuge and their confederate. Their pretext is that they say they fear that the authority and power be in the foreigners' hand and they be fallen in calamity.
Here is the verse: "But you will see those in whose hearts is disease hastening towards them, saying: We fear lest a calamity should befall us...." In answer to them, the Qur'an says that just as they think that someday the authority and power may be in the hand of the Jews and the Christians, they should also consider that Allah may bring a victory for the Muslims and they take-the authority and power in their own hand, so that these hypocrites be regretful for what they hid in their hearts.
"And those who believe will say: Are these they who swore by Allah with the most forcible of their oath that they were most surely with you?' Their (good) deeds failed and they themselves became losers." The final fate of the disbelievers is pointed out in this verse. It points to the time when the true believers gain the victory and the act of the hypocrites is made manifest.
Then the believers will surprisingly say whether these hypocrites are the same people who had so many claims and intensively swore that they were with the believers. Why did their final fate become like that?