“I asked Jaabir ibn Samurah, ‘Did you used to sit with the Messenger of Allaah?’ He said, ‘Yes, frequently. He would not get up from the place where he had prayed Subh until the sun rose. When the sun rose, he would get up. They used to talk about things that had happened during the Jaahiliyyah, and they would laugh and smile.’”Saheeh Muslim (1/463) , hadeeth of Sammaak ibn Harb
2. Refrain from sitting among smelly people.
Kitab Al-Salat, Book 004, Number 1147