Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai:2367 – al-Qāsim b. Zakariyyā b. Dīnār > Ḥusayn > Zāʾidah > ʿĀṣim > al-Musayyab > Ḥafṣah

"When the Messenger of Allah would lie down, he would place his right hand under his right cheek, and he used to fast on Mondays and Thursday."  

النسائي:٢٣٦٧ – أَخْبَرَنَا الْقَاسِمُ بْنُ زَكَرِيَّا بْنِ دِينَارٍ قَالَ حَدَّثَنَا حُسَيْنٌ عَنْ زَائِدَةَ عَنْ عَاصِمٍ عَنِ الْمُسَيَّبِ عَنْ حَفْصَةَ قَالَتْ

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا أَخَذَ مَضْجَعَهُ جَعَلَ كَفَّهُ الْيُمْنَى تَحْتَ خَدِّهِ الأَيْمَنِ وَكَانَ يَصُومُ الاِثْنَيْنَ وَالْخَمِيسَ  

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:2688 – al-Qāsim b. Zakariyyā > Ḥusayn > Zāʾidah > ʿĀṣim > al-Musayyab > Ḥafṣah

"When the Messenger of Allah would lie down, he would place his right hand under his right cheek, and he used to fast on Mondays and Thursday." (Using translation from Nasāʾī 2367)  

الكبرى للنسائي:٢٦٨٨ – أَخْبَرَنَا الْقَاسِمُ بْنُ زَكَرِيَّا قَالَ حَدَّثَنَا حُسَيْنٌ عَنْ زَائِدَةَ عَنْ عَاصِمٍ عَنِ الْمُسَيَّبِ عَنْ حَفْصَةَ قَالَتْ

كَانَ رَسُولُ اللهِ ﷺ «إِذَا أَخَذَ مَضْجَعَهُ جَعَلَ كَفَّهُ الْيُمْنَى تَحْتَ خَدِّهِ الْأَيْمَنِ وَكَانَ يَصُومُ الِاثْنَيْنِ وَالْخَمِيسَ»  

nasai-kubra:10531 – ʿAlī b. Ḥarb > al-Qāsim b. Yazīd > Sufyān > ʿĀṣim > al-Musayyab > Sawāʾ al-Khuzāʿī > Ḥafṣah

"When the Messenger of Allah would lie down, he would place his right hand under his right cheek, and he used to fast on Mondays and Thursday." (Using translation from Nasāʾī 2367)   

الكبرى للنسائي:١٠٥٣١ – أَخْبَرَنِي عَلِيُّ بْنُ حَرْبٍ عَنِ الْقَاسِمِ بْنِ يَزِيدَ قَالَ حَدَّثَنَا سُفْيَانُ عَنْ عَاصِمٍ عَنِ الْمُسَيَّبِ عَنْ سَوَاءٍ الْخُزَاعِيِّ عَنْ حَفْصَةَ قَالَتْ

«كَانَ رَسُولُ اللهِ ﷺ إِذَا أَخَذَ مَضْجَعَهُ وَضَعَ كَفَّهُ الْيُمْنَى تَحْتَ خَدِّهِ الْأَيْمَنِ»  

nasai-kubra:10532 – al-Qāsim b. Zakariyyā > Ḥusayn > Zāʾidah > ʿĀṣim > al-Musayyab > Ḥafṣah

"When the Messenger of Allah would lie down, he would place his right hand under his right cheek, and he used to fast on Mondays and Thursday." (Using translation from Nasāʾī 2367)   

الكبرى للنسائي:١٠٥٣٢ – أَخْبَرَنَا الْقَاسِمُ بْنُ زَكَرِيَّا قَالَ حَدَّثَنَا حُسَيْنٌ عَنْ زَائِدَةَ عَنْ عَاصِمٍ عَنِ الْمُسَيَّبِ عَنْ حَفْصَةَ قَالَتْ

«كَانَ رَسُولُ اللهِ ﷺ إِذَا أَخَذَ مَضْجَعَهُ جَعَلَ كَفَّهُ الْيُمْنَى تَحْتَ خَدِّهِ الْأَيْمَنِ»