(111) باب مَا يَقُولُ الرَّجُلُ إِذَا رَأَى الْهِلاَلَ
Narrated Qatadah:
When the Prophet of Allah (ﷺ) saw the new moon, he said: "a new moon of good and right guidance; a new moon of good and right guidance; a new moon of good and right guidance. I believe in Him Who created you" three times. He would then say: "Praise be to Allah Who has made such and such a month to pass and has brought such and such a month."
Reference: Sunan Abi Dawud 5092
In-book reference: Book 43, Hadith 320
English translation: Book 42, Hadith 5073