Clarifications about the True Fajr and the False Fajr
23-6-2019 | IslamWeb
Question:
Salam alekum wa rahmatullah. May Allah bless you and everyone else involved spreading correct and authentic knowledge about islam to the ummah. My question is with regards to fajr time and suhur ending time and this has got me quite confused. According to the hadith of muslim, our prophet (sallalahu alayhe wa salam) described the time for fajr as starting from the beginning of pre-dawn until the sun starts to rise, so if this is the case why does suhur time end when fajr time enters because allah says fasting starts when dawn breaks meaning when it’s bright outside and a distiction can be made between the dark of night and the light of dawn. I’m quite confused about this and don’t know when to stop eating and drinking and when fajr time starts. This whole ‘false dawn’ and ‘real dawn’ deal has complicatef things even further so if you could please clarify this for me i would be grateful. Jazakallah
Answer:
All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad 
is His slave and Messenger.
First of all, you should know that there are two kinds of Fajr:
The False Fajr: It starts before the true Fajr showing its light vertically in the sky from the East in the direction of the West. It is described in the Hadeeth "like the tail of the wolf." It is called false Fajr because its light disappears after its appearance and it is not the true Fajr. This is not the true Fajr by which the time of fasting and the time of the prayer begins; which is the second Fajr.
The True Fajr: It starts when dawn breaks horizontally from the South in the direction of the North. It is called the true Fajr because when its light appears it does not disappear; rather, its light increases gradually. When the true Fajr begins, it is easy to distinguish between the whiteness of dawn and the darkness of the night.
Shaykh Ibn 'Uthaymeen
said in Zaad al-Mee’aad, while clarifying the differences between the true Fajr and the false Fajr:
The first Fajr appears approximately half an hour before the second one and then it disappears, and the horizon becomes dark, then the second Fajr appears.
The scholars said: there are three differences between them.
The first difference is that the light of the true Fajr appears to spread whereas the light of the first Fajr [i.e. the false Fajr] is vertical (extending towards the center of the sky).
The second difference is that there is no darkness after the Second Fajr (which is the true Fajr); whereas the light of the first Fajr disappears and the horizon becomes dark after it.
The third difference is that the light of the Second Fajr [the true Fajr] is connected with the horizon; whereas the first Fajr is not. Meaning that the light of the Second Fajr spreads over the earth (atmosphere), whereas between the first Fajr and the atmosphere (horizon) there is darkness.
In the light of the above, the fasting person starts to refrain from eating and drinking when the second Fajr begins, which is the true Fajr and not from the false Fajr. The Hadeeth reads: "There are two kinds of Fajr. One kind, which is the true Fajr, prohibits eating (for the fasting person) and makes the prayer permissible. As for the second kind of Fajr (which is the false Fajr], it does not prevent eating (for the fasting person) nor does it permit the prayer (the Fajr prayer)." [Ibn Khuzaymah and al-Haakim, and they both classified it as Saheeh (authentic)]
Besides, Al-Haakim reported another Hadeeth from Jaabir 
with the same meaning. However, there is an addition about the Fajr that forbids food: "Its light goes upright in the horizon."; whereas in the first Hadeeth it reads "like the tail of the wolf."
For more benefit about the true Fajr and the false Fajr and the time of the first Fajr Athaan, please refer to Fataawa 381931, 347371, 88333, 92229 and 91205.
Allah knows best.