Sahih Muslim
The Book of Prayers (Kitab Al-Salat)
Book Number: 004 / Hadith Number: 870
Abdullah b. Mas'ud reported: The Messenger of Allah (may peace be upon him) said: Let those who are sedate and prudent be near me, then those who are next to them (saying it tliree tinies), and beware of the tumult of the markets.