Qutaybah says that al-Layth narrated the hadith to us with the same chain and text, except that he said: Then he (peace and blessings be upon him) would ask: "Which of them had learned more of the Qur'an?" And he (peace and blessings be upon him) also said: "I am a witness."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6796