Sitting Cross Legged

Jabir ibn Samurah Radiyallahu 'anhu narrates that when Nabi Sallallahu 'alaihi wasallam offered Salat-ul-Fajr, he would sit cross-legged where he was till the sun had come well up. (Abu Dawood)

Anas ibn Malik Radiyallahu 'anhu narrates that Rasullullah Sallallahu 'alaihi wasallam said: To sit with people who are doing the Dhikr of Allah after Salat-uli-Fajr till the sun rises is more pleasing to me than setting free four slaves from the progeny of Isma'il 'Alaihis Salam. And to sit with people who are doing the Dhikr of Allah after Salat-ul-'Asr till the sun sets is more pleasing to me than setting tree four slaves from the progeny of Isma'il 'Alaihis Salam. (Abu Dawood)
Note: The slaves from the progeny of Isma'il 'Alaihis Salam are mentioned in this hadith as they were considered the most noble amongst the Arabs, and so more valuable.