Hadith.1930 - Imam Jafar ibn Muhammad Al-Sadiq (as) was asked about a man who converted to Islam in the middle of the Month of Ramadan: What is required of him in terms of fasting? Imam (as) said: "He is only required to fast the days remaining from when he became Muslim, and he is not obligated to make up the days that have already passed."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.1931 - Safwan ibn Yahya narrated from Al-'Is ibn al-Qasim, who said: "I asked Abu Abdullah (as) about a group of people who converted to Islam during the Month of Ramadan after some days had passed. Are they required to fast the days that have passed, or the day they embraced Islam? Imam (as) said: 'They are not required to make up the missed days or to fast on the day they embraced Islam, unless they embraced Islam before the break of dawn on that day.'"

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.