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suyuti:2-1664bSaʿīd b. al-Msyb
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السيوطي:٢-١٦٦٤b

"عَنْ سَعِيد بْنِ المسيب أن عُمَرَ بْنَ الْخَطَّاب، وعثمان بن عفان كَانَا يفعلانِ ذلك -يعنى- الاستِلْقاءَ، وَوَضع إِحْدَى الرجلين على الأخرى".  

مالك، [هب] البيهقى في شعب الإيمان

See similar narrations below:

Collected by Bukhārī, Abū Dāwūd, Mālik
bukhari:475ʿAbdullāh b. Maslamah > Mālik > Ibn Shihāb > ʿAbbād b. Tamīm > ʿAmmih

that his uncle said, "I saw Messenger of Allah ﷺ lying flat (on his back) in the mosque with one leg on the other." Narrated Saʿid bin Al-Musaiyab that ʿUmar and ʿUthman used to do the same.  

البخاري:٤٧٥حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ عَنْ مَالِكٍ عَنِ ابْنِ شِهَابٍ عَنْ عَبَّادِ بْنِ تَمِيمٍ عَنْ عَمِّهِ

أَنَّهُ رَأَى رَسُولَ اللَّهِ ﷺ مُسْتَلْقِيًا فِي الْمَسْجِدِ وَاضِعًا إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى وَعَنِ ابْنِ شِهَابٍ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ قَالَ كَانَ عُمَرُ وَعُثْمَانُ يَفْعَلاَنِ ذَلِكَ  

abudawud:4867al-Qaʿnabī > Mālik > Ibn Shihāb > Saʿīd b. al-Musayyab > ʿUmar

‘Umar b. al-khattab and ‘Uthman b. ‘Affan used to do that.  

أبو داود:٤٨٦٧حَدَّثَنَا الْقَعْنَبِيُّ عَنْ مَالِكٍ عَنِ ابْنِ شِهَابٍ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ

أَنَّ عُمَرَ بْنَ الْخَطَّابِ ؓ وَعُثْمَانَ بْنَ عَفَّانَ كَانَا يَفْعَلاَنِ ذَلِكَ  

malik:9-96Mālik > Ibn Shihāb > Saʿīd b. al-Musayyab

Yahya related to me from Malik from Ibn Shihab from Said ihn al-Musayyab that Umar ibn al Khattab and Uthman ibn Affan, may Allah be pleased with them, used to do the same.  

مالك:٩-٩٦وَحَدَّثَنِي عَنْ مَالِكٍ عَنِ ابْنِ شِهَابٍ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ

أَنَّ عُمَرَ بْنَ الْخَطَّابِ وَعُثْمَانَ بْنَ عَفَّانَ ؓ ا كَانَا يَفْعَلاَنِ ذَلِكَ