It is narrated from Sayyiduna Talhah (may Allah be pleased with him) that whenever the Prophet (peace and blessings be upon him) saw a new moon, he would recite this supplication: «اَللّٰهُمَّ أَهِلَّهُ عَلَيْنَا بِالْيُمْنِ وَالْإِيمَانِ وَالسَّلَامَةِ وَالْإِسْلَامِ رَبِّي وَرَبُّكَ اللّٰهُ» "O Allah! Let this moon rise upon us with blessing and faith, with safety and Islam. O moon! My Lord and your Lord is Allah."