Abu Imran al-Jawni relates that it is narrated from Sayyiduna Jundub (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Gather over the Qur'an for as long as you remain in agreement over it; then when you begin to differ about it, get up."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1662