Prophet [PBUH] would make a special dua on sighting the moon of Ramadhaan:
It was the practice of the Prophet [sallallaahu alaihi wa sallam] to make special dua on sighting the moon every month but for the moon of Ramadhaan he would make a special dua.
It is narrated in Nisai when he would see the moon of Ramadhaan he would say (special dua):
"This moon is of good and barakah, this moon is of good and barakah and I have faith upon the one who created you.”
(Athaaf Ahl ul Islaam from Nisai)
Tibraani narrates special dua from Syeduna Anas that when the months of Rajab and Shabaan would begin he would supplicate (a special dua)
“Oh Allah! Make Rajab and Shabaan blessed for us and grant us Ramadan.”
The Prophe would accept the testimony of one person:
If the Prophet [sallallaahu alaihi wa sallam] and most of the companions had not sighted the moon themselves but only a single Muslim had testified that he had seen the moon the Prophet [sallallaahu alaihi wa sallam] would proclaim (the beginning of) Ramadhaan.
It is from Syeduna Abdullah bin Abbaas that a bedouin came to the Prophet [sallallaahu alaihi wa sallam] and pleaded
“I have seen the moon tonight.”
He [sallallaahu alaihi wa sallam] asked:
"If he believed in Tawheed, Allah and Prophethood, i.e. if he was a Muslim”
He replied:
"Yaa Rasoolallah I am a Muslim.”
The Prophet [sallallaahu alaihi wa sallam] called for Syeduna Bilaal and ordered:
"Announce to the People that they should fast tomorrow.”
(Abu Dawud)
It is from Syeduna Abdullah bin Umar:
"The people were searching for the moon and I sighted it and said to the Prophet [sallallaahu alaihi wa sallam]:
"Verily I have seen it”
So He [sallallaahu alaihi wa sallam] himself fasted and ordered the people to fast.”
