The First Two Caliphs vs Angels Gabriel and Michael!

The Imam was the leader of the Shia community. He used every opportunity to defend the principles of the Shia belief. During the Imam’s brief stay in Baghdad, Yahya ibn Aktham, who had been defeated in his previous debate with the Imam, tried to challenge him with a critical question about the Shia belief against the first and the second caliphs. He asked the Imam’s opinion about a fabricated narration stating that angel Gabriel came to the Prophet and told him that God says that He is pleased with the first caliph, and asked the Prophet to ask the first caliph if he is also pleased with God. The Imam responded that the Prophet told the Muslims in his last Hajj that many will attribute lies to him after his death. The Prophet advised the Muslims to validate any narration attributed to him with the Quran and his tradition. The Imam then told Yahya that this narration was not valid as it was against the Quran by referring to the following verse [50:16]: “Surely We have created man, and We know the promptings of his heart, and We are nearer to him than even his jugular vein.” The Imam questioned how it was possible that God did not know the first caliph’s opinion about Himself and needed to ask the Prophet.
Yahya did not give up and asked the Imam’s opinion about another narration attributed to the Prophet, which states that the first and the second caliphs on the earth are like the angels Gabriel and Michael in heaven. The Imam responded that the angels Gabriel and Michael were never infidels, nor ever disobeyed God by committing even a single sin. The Imam then challenged this inequal comparison and said that the first and the second caliphs were infidels before converting to Islam and spent most of their lives in infidelity to God.
Yahya then asked the Imam’s opinion about another narration attributed to the Prophet, which states that the first and the second caliphs are the leaders of the elders in paradise. The Imam responded that all of the people in paradise will be young, and no elderly person will be found. The Imam then said that this narration was fabricated by the Umayyads to belittle the Prophet’s narration that Imam Hasan and Imam Hossein are the leaders of the youth in paradise.
Yahya continued and stated another fabricated narration in which the Prophet had said, "If I was not selected for the Prophethood, indeed the second caliph would have been selected instead." The Imam rejected this false narration by referring to the following verse of the Quran [33:7]: “Recall, (O’ Prophet), that We received a pledge from the prophets, and from you, and from Noah, and Abraham, and Moses, and Jesus son of Mary. We received from them a solemn pledge." The Imam then said that God had taken a pledge from the Prophets for their prophethood, so how could he change his covenant? He questioned Yahya that none of the prophets became an infidel for even a single moment in their life, so how it could be possible for God to select someone as his prophet