The Holy Prophet said:

"There is none whom I owe obligation and I did not repay it except Abu Bakr, for I owe him much for which Allah will compensate him on the Day of Judgment."

None among the early Muslims was given the epithet" the verifier" but Abu-Bakr. He was given this epithet by the prophet because:

 Abu-Baker was the first among men who believed in the prophet, when the prophet exposed him to Islam he accepted without any reluctance; the Prophet Mohammed says

” Never did I invite any person to accept Islam but hesitated and expressed anxieties save Abu-Bkr who embraced it without the slightest hesitation.".”

His belief in Muhammad reached a degree that he believed what seemed to people impossible;After the death of the prophet’s wife Khadiga and after the demise of his supportive parental uncle, the prophet went to the city of Taif to expose the masters there to Islam but there he was rejected and offended. To relieve him, God granted him with the night Journey in which the prophet accompanied the archangel, he travelled to Jerusalem and then he ascended into heaven.

When the prophet told the Mekkans of that they belied him and raced to Abu-Baker to tell him thinking that his belief and faith would be shaken.

“Have you heard what your companion said?”

said the idol-worshippers

“What did he say?”

Said Abu-Baker

“He claimed that he had travelled to Jerusalem and then ascended into the heaven and returned.”

said the idolaters

“What is there strange in his words? I believe him regarding God’s word being revealed to him in no time from the heavens. How then can’t I believe that he did that?”

said Abu-Baker.

Abu-Bakr was the strongest in faith if he is compared with all the Muslims, the prophet ssaid commenting on his never-shaken faith” He (Abu-Bakr) didn’t excel you by his many prayers or fasting, he excelled you in something that deeply embedded in his heart.”

The prophet says

” If the belief of the whole nation is put in a balance and Abu-Bakr’s put in another, Abu-Baker’s belief will overbalance.”