Did the Companions, concerning whom the verse was revealed: "And if two factions among the believers..." commit an apostasy that is unforgivable?

The story speaks of the revelation of the noble verse after an incident that took place between the Prophet, peace and blessings be upon him, and Abdullah ibn Ubayy, the leader of the hypocrites. The Prophet went to him to invite him [to Islam], but Abdullah ibn Ubayy behaved improperly. The matter escalated into a quarrel between the followers of each party, where the Muslims defended the Prophet, peace and blessings be upon him, while hypocrites defended Abdullah ibn Ubayy. In another narration, one of the two groups was described as believers and the other as disbelievers. The story confirms that the Companions concerning whom the verse was revealed did not disbelieve; rather, they were defenders of the Prophet, peace and blessings be upon him, and Muslims must believe in their righteousness and goodness.