Ibn Shihab (may Allah have mercy on him) narrates that on that occasion they differed over 'al-tabut': Sayyiduna Zayd (may Allah be pleased with him) said 'al-tabuh', while Sayyiduna Sa'id bin al-As and Sayyiduna Ibn al-Zubayr (may Allah be pleased with them both) said 'al-tabut'. They took their matter to Sayyiduna Uthman (may Allah be pleased with him), and he said: "Write it as 'al-tabut', for it (the Qur'an) is in their (the Qurayshis') dialect."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3994