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.
suyuti:502a
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السيوطي:٥٠٢a

("أثقلُ الصلاةِ على المنافقين: صلاةُ العشاءِ، وصلاةُ الفجرِ".  

[خ] البخاري [م] مسلم عن أبي هريرة)

See similar narrations below:

Collected by Ibn Mājah, Ṭabarānī
ibnmajah:797Abū Bakr b. Abū Shaybah > Abū Muʿāwiyah > al-Aʿmash > Abū Ṣāliḥ > Abū Hurayrah

"The Messenger of Allah said: 'The most burdensome prayers for the hypocrites are the 'Isha' prayer and the Fajr prayer. If only they knew what (reward) there is in them, they would come to them even if they had to crawl.'"  

ابن ماجة:٧٩٧حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ أَنْبَأَنَا أَبُو مُعَاوِيَةَ عَنِ الأَعْمَشِ عَنْ أَبِي صَالِحٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ أَثْقَلَ الصَّلاَةِ عَلَى الْمُنَافِقِينَ صَلاَةُ الْعِشَاءِ وَصَلاَةُ الْفَجْرِ وَلَوْ يَعْلَمُونَ مَا فِيهِمَا لأَتَوْهُمَا وَلَوْ حَبْوًا  

tabarani:9409Muḥammad b. al-Naḍr al-Azdī > Muʿāwiyah b. ʿAmr > Zāʾidah > Abū Ḥuṣayn al-Asadī > al-Aswad b. Hilāl > ʿAbdullāh b. Masʿūd

[Machine] "The period between the two prayers is considered to be a voluntary prayer, and specifically the period between the Isha (Night) prayer and the Fajr (Dawn) prayer."  

الطبراني:٩٤٠٩حَدَّثَنَا مُحَمَّدُ بْنُ النَّضْرِ الْأَزْدِيُّ ثنا مُعَاوِيَةُ بْنُ عَمْرٍو ثنا زَائِدَةُ ثنا أَبُو حُصَيْنٍ الْأَسَدِيُّ عَنِ الْأَسْوَدِ بْنِ هِلَالٍ عَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ قَالَ

«مَا بَيْنَ الصَّلَاتَيْنِ وِتْرٌ مَا بَيْنَ صَلَاةِ الْعِشَاءِ وَصَلَاةِ الْفَجْرِ»