"And his people argued with him. He said, 'Do you argue with me concerning Allah while He has guided me? And I fear not what you associate with Him,'"—meaning: their idols which they used to worship.

Muhammad said:

Abu Ubaid mentioned that Nafi' recited: "Atuhajjunni" (Do you argue with me?) with the nun lightened, and similarly: "Say, 'Do you command me to worship other than Allah?'" He said: And the people of Iraq recited both with the nun intensified (heavy): "Atuhajjunni" and "Ta'murunni."

Abu Ubaid said:

Such is the recitation according to us, with both of them intensified, because the origin is to have two nuns: the nun of the verb and the nun of the first-person pronoun. When they were written in the Mushaf (codex) according to...