Shaykh Umar Farooq Saeedi
Benefits and Issues:
The aforementioned supplication is, by consensus of the verifying scholars, weak. However, there is another supplication found in Musnad Ahmad and Jami‘ al-Tirmidhi regarding which the verifying scholars have written:
Hasan li-shawahidihi, meaning this supplication is of the Hasan (good) grade due to supporting narrations.
And that supplication is as follows:
Allahu Akbar. Allahumma ahillahu ‘alayna bil-amni wal-iman, was-salamati wal-islam, rabbuna wa rabbuka Allah.
(Musnad Ahmad 1/162 and Jami‘ al-Tirmidhi, Kitab al-Da‘awat, Hadith 3451)
Whereas another supplication is also found in Sunan al-Darimi,
the wording of which is:
Allahu Akbar. Allahumma ahillahu ‘alayna bil-amni wal-iman, was-salamati wal-islam, wat-tawfiqi lima tuhibbu wa tarda, rabbuna wa rabbuka Allah. (Sunan al-Darimi, Kitab al-Sawm, Chapter: What is said upon sighting the new moon, Hadith 1693)
Therefore, upon sighting the new moon, either of these two supplications may be recited.
For details, see:
(al-Mawsu‘ah al-Hadithiyyah, Musnad Imam Ahmad: 3/317, 381, Hadith 1397 and Sahih Sunan al-Tirmidhi by al-Albani: 3/157, Hadith 3451)
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 5092