Hadith #2431Fasting (Kitab Al-Siyam) · Narrated by Harun bin Salman هارون بن سلمان, Muhammad bin 'Uthman bin Kramh محمد بن عثمان بن كرامة, Ubaidullah bin Musa bin Abi al-Mukhtar عبيد الله بن موسى بن أبي المختار باذام · Sahih
The month most liked by the Messenger of Allah (ﷺ) for fasting was Sha’ban. He then joined it with Ramadan.