اللهُ أَكْـبَر، اللّهُمَّ أَهِلَّـهُ عَلَيْـنا بِالأمْـنِ وَالإيمـان، والسَّلامَـةِ والإسْلام، وَالتَّـوْفيـقِ لِما تُحِـبُّ رَبَّنـا وَتَـرْضـى، رَبُّنـا وَرَبُّكَ الله
Allaahu Akbar, Allaahumma ahillahu alayna bil amni wal eemaani, wassalaamati wal- Islaami, wattawfeeqi limaa tuhibbu Rabbanaa wa tardhaa, Rabbunaa wa Rabbukallaahu .
Allah is the Greatest. O Allah, bring us the new moon with security and Faith, with peace and in Islam, and in harmony with what our Lord loves and what pleases Him. Our Lord and your Lord is Allah.
Reference: At-Tirmithi 5/504, Ad-Darimi 1/336. See also Al-Albani, Sahih At-Tirmithi 3/157.