On what one says when seeing the new moon

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

220. Chapter: On what one says when seeing the new moon

1228. Talha ibn 'Ubaydullah reported that When the Prophet, may Allah bless him and grant him peace, saw the new moon, he would say, "O Allah, make the new moon shine on us with security, belief, safety and Islam! My Lord and your Lord is Allah. It is a new moon of guidance and good." [at-Tirmidhi]