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:20676a –
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السيوطي:٢٠٦٧٦a –

"مَنِ اعتَكَفَ عَشْرًا فِي رَمَضَانَ كَانَ كَحَجَّتَين وَعُمْرَتَينِ".  

[هب] البيهقى في شعب الإيمان وضعفه، والديلمى عن علي بن حسين عن أَبيه

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:2888 – Muḥammad b. al-Faḍl al-Saqaṭī > Saʿīd b. Sulaymān > al-Hayyāj b. Bisṭām > ʿAnbasah > Muḥammad b. Sulaymān > ʿAlī b. al-Ḥusayn from his father

[Machine] That the Messenger of Allah ﷺ said: "Observing Iʿtikāf (seclusion for worship) for ten days in Ramadan is like performing two Hajj pilgrimages and two Umrah pilgrimages."  

الطبراني:٢٨٨٨ – حَدَّثَنَا مُحَمَّدُ بْنُ الْفَضْلِ السَّقَطِيُّ ثنا سَعِيدُ بْنُ سُلَيْمَانَ ثنا الْهَيَّاجُ بْنُ بِسْطَامٍ ثنا عَنْبَسَةُ عَنْ مُحَمَّدِ بْنِ سُلَيْمَانَ عَنْ عَلِيِّ بْنِ الْحُسَيْنِ عَنْ أَبِيهِ

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «اعْتِكَافُ عَشْرٍ فِي رَمَضَانَ كَحَجَّتَيْنِ وَعُمْرَتَيْنِ»