Ibrahim reports that Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) recited (the verse of Surah al-Jumu'ah): "When the call is made for the prayer on the day of Jumu'ah, then hasten (fas'aw) to the remembrance of Allah" [Surah al-Jumu'ah: 9]. Sayyiduna Abdullah (may Allah be pleased with him) said: "If I were to read it as 'fas'aw' (run), I would go so fast that my cloak would fall off." And he used to read it as 'famdu' (proceed).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9505