What is the ruling on one who does not fast upon the confirmed sighting of the Ramadan crescent, preferring to fast when he sights it himself, citing the hadith: "Fast upon seeing it and break your fast upon seeing it"? And is his citing of this hadith valid?

Fasting becomes obligatory if the sighting of the crescent moon is confirmed by the testimony of a single trustworthy person, for the Prophet, peace and blessings be upon him, commanded fasting based on the testimony of a Bedouin. The inference from the hadith "Fast when you see it (the crescent moon) and break your fast when you see it" that each individual should not fast unless they personally see it is incorrect. The hadith is a general address that includes everyone when the sighting is confirmed, even by a single trustworthy person. What indicates the sufficiency of the sighting of a single trustworthy person for the obligation of fasting upon all Muslims is the hadith of Ibn 'Umar, may Allah be pleased with them both: "The people looked for the crescent moon, and I informed the Messenger of Allah, peace and blessings be upon him, that I had seen it, so he fasted and commanded the people to fast." As for the delay of some innovators in fasting due to their belief that it is not obligatory except by personal sighting, this is a misguidance, and they are refuted by the hadiths and the situation of the blind and those with poor vision.