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:14458a –

"Rajab is the month of Allah, and Sha'ban is my month, and Ramadan is the month of my Ummah."  

السيوطي:١٤٤٥٨a –

"رجبٌ شَهْرُ اللَّه، وشَعْبانُ شَهْرى، ورمضَانُ شَهْرُ أُمَّتى".  

أبو الفتح بن أَبى الفوارس في أَماليه عن الحسن مرسلًا

See similar narrations below:

Collected by Suyūṭī