Those who accepted the testimony of one witness on sighting the new moon

Ikrimah says: A Bedouin testified before the Prophet (peace and blessings be upon him) to having seen the moon (of Ramadan). He asked him: "Do you testify that there is no god but Allah and that I am the Messenger of Allah?" He said: Yes. The Prophet (peace and blessings be upon him) ordered the people to fast.

Ibn Abi Layla says: Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) accepted the testimony of one man concerning the new moon.

Abd al-Malik bin Maysarah says: I was present in Madinah at the sighting of the moon of Ramadan or of Shawwal. Only one man testified about the moon, and Sayyiduna Ibn Umar (may Allah be pleased with them both) ordered that his testimony be accepted.

Sayyiduna Ibn Abbas (may Allah be pleased with them both) says: Once a Bedouin came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah, I saw the new moon tonight. He asked him: "Do you testify that there is no god but Allah and that Muhammad is His servant and His Messenger?" He said: Yes. The Prophet (peace and blessings be upon him) said: "O Bilal, announce among the people that they should fast tomorrow."