Silsilah as-Sahihah 3061 — Dua Upon Sighting the Crescent

Sayyiduna Talhah bin Ubaidullah (may Allah be pleased with him) narrates that when the Messenger of Allah (peace and blessings be upon him) would see the new moon, he would say: "O Allah! Let it rise upon us with security, faith, safety, and Islam. (O moon!) My Lord and your Lord is Allah."