Uqbah bin Amr (may Allah be pleased with him) says: "I do not see any man more knowledgeable of what was revealed to Muhammad (peace and blessings be upon him) than Abdullah." Abu Musa (may Allah be pleased with him) said: "If that is said, (then know that) he used to hear when others did not hear, and he used to enter when others did not enter."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8463