Amr bin Mnswr al-Nsa'iy عمرو بن منصور النسائي أبو سعيد · The Book of Fasting

"The Messenger of Allah said: 'D not anticipate the month until you complete the number, or you see the crescent. Then fast, and do not stop fasting until you see the crescent, or your complete thirty days."' (Sahih) Al-Hajjaj bin Artah reported it in a Mursal from.

"We were traveling with the Prophet and among us were some who were fasting and some who were not criticize those who were not, and those who were not fasting did not criticize those who were."

concerning this verse "And as for those who can fast with difficulty, (a choice either to fast or) to feed a Miskin (poor person) (for every day)." That for those who can fast with difficulty means they find it hard; to feed a Miskin means feeding one poor person for each day. But whoever does good of his own accord means feeding another poor person. This is not abrogated, and it is bette for him. And: that "you fast is…