1228/1 - Talhah ibn ‘Ubaydillāh (may Allah be pleased with him) reported that when the Prophet (may Allah’s peace and blessings be upon him) saw the new moon, he would say: “Allahumma ahillahu ‘alayna bil-amni wal-īmān was-salāmati wal-islām. Rabbi wa rabbuk Allah. Hilālu rushdin wa khayr (O Allah, let this new moon pass over us with security, faith, safety, and in the belief of Islam. My Lord and yours is Allah. A new moon of right guidance and goodness).” [Narrated by Al-Tirmidhi; and he classified it as Hasan (sound)]
1) It is recommended to say this supplication upon sighting the new moon of every (lunar) month.
2) When a person regularly makes the Prophetic supplication for security, faith, safety, and remaining in Islam, he thus combines all desired things and seeks salvation from all feared ones.
3) A person should take pride in being a servant of Allah Almighty, Who is the Lord and Possessor of all things, and He is the One worthy of being worshiped and glorified. Planets, stars, or stones should not be worshiped, for they are created beings, not deities.