Those who said: it is valid only with the testimony of two men

Abu Uthman says: Once two Bedouins came together to the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) asked them: "Are you both Muslims?" They said: Yes. The Prophet (peace and blessings be upon him) asked them: "Have you seen the new moon?" They said: Yes. The Prophet (peace and blessings be upon him) ordered the people to fast, or to celebrate Eid.

Sayyiduna Ali (may Allah be pleased with him) says concerning the sighting of the new moon: If two upright men testify to having seen the moon, then celebrate Eid (break your fast).

Amr bin Dinar says: Sayyiduna Uthman (may Allah be pleased with him) refused to accept the testimony of Hashim bin Utbah (or someone else) concerning the sighting of the new moon.

Al-Hasan says concerning a person who has seen the moon alone: He should fast with the people and celebrate Eid with the people.

Al-Hasan says concerning a person who has seen the moon alone: No attention will be paid to his sighting.

Abu Wa'il says: We were at a place called Khaniqin. We sighted the moon of Ramadan, and some of us fasted while some of us did not. Then a letter from Sayyiduna Umar (may Allah be pleased with him) came to us, in which it was written: Some new moons are bigger than others. When you see the new moon during the day, do not break the fast until two Muslim men testify that they sighted it the previous evening.