Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "The first things Allah Almighty created were the Pen and the fish (Nun). The Pen asked: What shall I write? Allah Almighty said: Everything that is to be until the Day of Resurrection." Then he recited this verse: "Nun. By the Pen." So Nun means the fish, and the Pen means the pen.
Imam al-Tabarani (may Allah have mercy on him) says: No one narrated it from Hammad bin Zayd as a marfu' (Prophetic) report except Mu'ammal bin Isma'il.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12175