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-kubra:1578 – Abū ʿĀṣim Khushaysh b. Aṣram > Ḥabbān b. Hilāl > Ḥabīb > ʿAmr b. Harim > Jābir b. Zayd > Ibn ʿAbbās > Jamaʿ Bi-al-Baṣrah al-Ūlá And al-ʿAṣr Lays Baynahumā Shayʾ Wa-al-Maghrib Wa-al-ʿIshāʾ Walays Baynahumā Shayʾ Faʿal Dhalik from Shughl Wazaʿam Ibn ʿAbbās

It was narrated from Ibn 'Abbas that he prayed Al-Uula (Zuhr) and 'Asr together in Al-Basrah with nothing in between them, and he prayed Maghrib and 'Isha' together with nothing in between them. He did that because he was busy and Ibn 'Abbas said that he had prayed Zuhr and 'Isha' together with the Messenger of Allah ﷺ in Al-Madinah, eight Rak'ahs with nothing in between. (Using translation from Nasāʾī 590)  

الكبرى للنسائي:١٥٧٨ – أَخْبَرَنَا أَبُو عَاصِمٍ خُشَيْشُ بْنُ أَصْرَمَ قَالَ حَدَّثَنَا حَبَّانُ بْنُ هِلَالٍ قَالَ حَدَّثَنَا حَبِيبٌ عَنْ عَمْرِو بْنِ هَرِمٍ عَنْ جَابِرِ بْنِ زَيْدٍ عَنِ ابْنِ عَبَّاسٍ أَنَّهُ جَمَعَ بِالْبَصْرَةِ الْأُولَى وَالْعَصْرَ لَيْسَ بَيْنَهُمَا شَيْءٌ وَالْمَغْرِبَ وَالْعِشَاءَ وَلَيْسَ بَيْنَهُمَا شَيْءٌ فَعَلَ ذَلِكَ مِنْ شُغْلٍ وَزَعَمَ ابْنُ عَبَّاسٍ

أَنَّهُ صَلَّى مَعَ رَسُولِ اللهِ ﷺ بِالْمَدِينَةِ الْأُولَى وَالْعَصْرَ ثَمَانِيَ سَجَدَاتٍ لَيْسَ بَيْنَهُمَا شَيْءٌ  

See similar narrations below:

Collected by Nasāʾī
nasai:590 – Abū ʿĀṣim Khushaysh b. Aṣram > Ḥabbān b. Hilāl > Ḥabīb / Ibn Abū Ḥabīb > ʿAmr b. Harim > Jābir b. Zayd > Ibn ʿAbbās > Ṣallá Bi-al-Baṣrah al-Ūlá Wa-al-ʿAṣr Lays Baynahumā Shaʾ Wa-al-Maghrib Wa-al-ʿIshāʾ Lays Baynahumā Shaʾ Faʿal Dhalik from Shughl Wazaʿam Ibn ʿAbbās

It was narrated from Ibn 'Abbas that he prayed Al-Uula (Zuhr) and 'Asr together in Al-Basrah with nothing in between them, and he prayed Maghrib and 'Isha' together with nothing in between them. He did that because he was busy and Ibn 'Abbas said that he had prayed Zuhr and 'Isha' together with the Messenger of Allah ﷺ in Al-Madinah, eight Rak'ahs with nothing in between.  

النسائي:٥٩٠ – أَخْبَرَنَا أَبُو عَاصِمٍ خُشَيْشُ بْنُ أَصْرَمَ قَالَ حَدَّثَنَا حَبَّانُ بْنُ هِلاَلٍ حَدَّثَنَا حَبِيبٌ وَهُوَ ابْنُ أَبِي حَبِيبٍ عَنْ عَمْرِو بْنِ هَرِمٍ عَنْ جَابِرِ بْنِ زَيْدٍ عَنِ ابْنِ عَبَّاسٍ أَنَّهُ صَلَّى بِالْبَصْرَةِ الأُولَى وَالْعَصْرَ لَيْسَ بَيْنَهُمَا شَىْءٌ وَالْمَغْرِبَ وَالْعِشَاءَ لَيْسَ بَيْنَهُمَا شَىْءٌ فَعَلَ ذَلِكَ مِنْ شُغْلٍ وَزَعَمَ ابْنُ عَبَّاسٍ

أَنَّهُ صَلَّى مَعَ رَسُولِ اللَّهِ ﷺ بِالْمَدِينَةِ الأُولَى وَالْعَصْرَ ثَمَانِ سَجَدَاتٍ لَيْسَ بَيْنَهُمَا شَىْءٌ