Please read the both narrations written in Bukhari
Another Narration
If we read the above two narrations of Bukhari, we can easily find out that Umar bin Khatab was among those people who run away in the battle of Hunain. Abu Qatadah says that the Companions run away from the battle, I also run away, there I met Umar bin Khattab among those people. Abu Qatadah asked Umar bin Khattab, what happened to the people? Umar bin Khattab replied it is the will of Allah!
We know only few companions remained with the Holy Prophet, everybody else run away. Quran also states the situation about Hunain (9:25).
We find the Umar bin Khattab's words that this is Allah's order or Allah's will to run away. We want to share Allah's order from Quran that it is very sever to run away in battle field especially leaving the holy prophet in the hands of enemies and saving own life.
Please read the verse of Quran (8;15-16)
"O you who believe! when you meet those who disbelieve marching for war, then turn not your backs to them.And whoever shall turn his back to them on that day-- unless he turn aside for the sake of fighting or withdraws to a company-- then he, indeed, becomes deserving of Allah's wrath, and his abode is hell; and an evil destination shall it be.
We should not have difficulty to understand this reality that anybody who run away in the battle by leaving the holy Prophet in the hands of enimies, it clearly means it that the faith is not deeply penetarted to his heart. We also know that the war of Hunain was fought at the end times of holy prophet, after the victory of Mecca.
Quran mentioned the virtues of true faithful believers.Quran tells us about the true faithful believers that they remain patient in distress and in the time of war.
Please read the verse (2:177)
"Righteousness is not determined by facing East or West during prayer. Righteousness consists of the belief in God, the Day of Judgment, the angels, the Books of God, His Prophets; to give money for the love of God to relatives, orphans, the destitute, and those who are on a journey and in urgent need of money, beggars; to set free slaves and to be steadfast in prayer, to pay the religious tax (zakat) to fulfill one's promises, and to exercise patience in poverty, in distress, and in times of war. Such people who do these are truly righteous and pious."
This was not the earlier time of Islam, the Battle of Hunain ws fought after the victory of Mecca!
Sunni fellows say that the companions run away in Uhod only 12 people remained with the Holy Prophet (pbuh). Because it was earliar time of Islam, they did not learnt much about Islam from the Prophet. But the battle of Hunain is the end time!