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:19208a –
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السيوطي:١٩٢٠٨a –

"مَا مِنْ أَرْبَعِين مِنْ مُؤْمِن يَسْتَغْفروُن لِمُؤْمِن، إِلا شَفَّعهم اللهُ فيه".  

[هـ] ابن ماجة [طب] الطبرانى في الكبير عن ابن عباس

See similar narrations below:

Collected by Ṭabarānī
tabarani:12158 – Aḥmad b. Yaḥyá al-Ḥulwānī > Ibrāhīm b. al-Mundhir al-Ḥizāmī > Bakr b. Sulaym al-Ṣawwāf > Ḥumayd al-Kharrāṭ > Kurayb > Ibn ʿAbbās

[Machine] I heard the Messenger of Allah ﷺ saying, "There is no group of forty people who intercede for a believer except that Allah will grant them intercession."  

الطبراني:١٢١٥٨ – حَدَّثَنَا أَحْمَدُ بْنُ يَحْيَى الْحُلْوَانِيُّ ثنا إِبْرَاهِيمُ بْنُ الْمُنْذِرِ الْحِزَامِيُّ ثنا بَكْرُ بْنُ سُلَيْمٍ الصَّوَّافُ ثنا حُمَيْدُ الْخَرَّاطُ عَنْ كُرَيْبٍ عَنِ ابْنِ عَبَّاسٍ قَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «مَا مِنْ أَرْبَعِينَ يَشْفَعُوا لِمُؤْمِنٍ إِلَّا شَفَّعَهُمُ اللهُ»