Al-Adab Al-Mufrad #1183
Sitting and lying down
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا إِبْرَاهِيمُ بْنُ الْمُنْذِرِ قَالَ: حَدَّثَنِي مَعْنٌ قَالَ: حَدَّثَنِي أَبُو رُزَيْقٍ، أَنَّهُ رَأَى عَلِيَّ بْنَ عَبْدِ اللهِ بْنِ عَبَّاسٍ، جَالِسًا مُتَرَبِّعًا، وَاضِعًا إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى، الْيُمْنَى عَلَى الْيُسْرَى.
Abu Ruzayq related that he saw 'Ali ibn 'Abdullah ibn 'Abbas sitting
cross-legged with one foot crossed over the other, the right on the left.
About Al-Adab Al-Mufrad
This hadith is #1183 from Al-Adab Al-Mufrad, in the Book of Sitting and lying down.