Fasting: Is Moon Sighting a Kifāʾī Obligation or Just Recommended Caution?

Practical Laws of Islam as per the teachings of Imam Khamenei

Fasting: Is Moon Sighting a Kifāʾī Obligation or Just Recommended Caution?

English:

Question #843:

Is watching out for the new moon a kifā’ī obligation or something to be done as an obligatory caution?

Answer #843:

It is not a shar‘ī duty in itself.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Fasting