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
suyuti:22499a –
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السيوطي:٢٢٤٩٩a –

"مَنْ قَال: جَزَى الله مُحَمَّدًا عَنَّا مَا هُوَ أَهْلُهُ، أَتْعَبَ سَبْعِينَ كَاتِبًا أَلْفَ صَبَاحٍ".  

طَبْ، حلْ والخَطيبُ وابنُ النجارِ عَن ابن عَبَّاسِ

See similar narrations below:

Collected by Ṭabarānī
tabarani:11509 – Aḥmad b. Rishdīn > Hāniʾ b. al-Mutawakkil al-Iskandarānī > Muʿāwiyah b. Ṣāliḥ > Jaʿfar b. Muḥammad > ʿIkrimah > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said, "Whoever says, 'May Allah reward Muhammad for us according to what is he worthy of', seventy scribes will become exhausted writing in the morning."  

الطبراني:١١٥٠٩ – حَدَّثَنَا أَحْمَدُ بْنُ رِشْدِينَ ثنا هَانِئُ بْنُ الْمُتَوَكِّلِ الْإِسْكَنْدَرَانِيُّ ثنا مُعَاوِيَةُ بْنُ صَالِحٍ عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «مَنْ قَالَ جَزَى اللهُ مُحَمَّدًا عَنَّا مَا هُوَ أَهْلُهُ أَتْعَبَ سَبْعِينَ كَاتِبًا أَلْفَ صَبَاحٍ»