It is narrated from Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him), he says: I recited a verse and Sayyiduna Ibn Mas'ud (may Allah be pleased with him) also recited a verse, but his verse was different from mine. So I came to the Noble Prophet (peace and blessings be upon him) and said: Did you not teach me such and such verse in this way? The Prophet (peace and blessings be upon him) said: Why not. Sayyiduna Ibn Mas'ud (may Allah be pleased with him) said: Did you not teach me this in such and such way? The Prophet (peace and blessings be upon him) said: Both of you have recited correctly. I (Ubayy) said: How can both be correct? The Prophet (peace and blessings be upon him) struck his hand on my chest and said: O Ubayy! The Qur'an was taught to me and it was said: upon one or two recitations? The angel who was with me said: upon two recitations. I said: upon two recitations. But then he said: upon two recitations or three? The angel who was with me said: upon three recitations. I said: upon three recitations, until it reached seven recitations, each one satisfactory and sufficient. If you say غَفُورًا رَحِیمًا (Most Forgiving, Most Merciful), or you say سَمِیعًا عَلِیمًا (All-Hearing, All-Knowing), or you say عَلِیمًا سَمِیعًا (All-Knowing, All-Hearing), then Allah is just as He is. In another narration it is mentioned: When the Prophet (peace and blessings be upon him) struck my chest and said: O Allah! Remove doubt from Ubayy. Ubayy says: I became drenched in sweat and my stomach was filled with fear. The Noble Prophet (peace and blessings be upon him) said: O Ubayy! Two angels came to me, one of them said: Recite the Qur'an upon one recitation, the other said: Increase it, I also said: Increase it, he said: Recite upon four recitations, the other said: Increase it more, I also said: Increase it for me, he said: Recite upon five recitations, the other said: Increase it more, I also said: Increase it more, recite upon six recitations, the other said: Increase it more, he said: Recite upon seven recitations.