Thefuqaha' begin with salat al-zuhr, because it was the first salat to be declared obligatory, followed by the 'asr, the maghrib, the 'isha' and the subh prayer, in that order. All the five prayers were made obligatory on the night of Prophet's cosmic journey (al 'Isra'), nine years after the beginning of his mission (bi'thah).
TheFajr prayer (Arabic: صلاة الفجر ṣalāt al-fajr, "dawn prayer") is the first of the five mandatory salah (Islamic prayer), to be performed anytime starting from the moment of dawn, but not after sunrise (at least 15 minutes before sunrise). The Isha prayer, which is the daily prayer directly before the Fajr prayer, usually does not take place after midnight (depending on location).
Waalaykum salam wa rahmatuLlahi wa barakatuHu, Five daily prayers are obligatory. Each consists of a certain number of rakahs, as follows: 1) Subh is a two rakah prayer [the morning prayer]. 2) Zuhr is a four rakah prayer [the afternoon prayer]. 3) Asr is a four rakah prayer [the mid-afternoon prayer]. 4) Maghrib is a three rakah prayer [the Narratedby al-Bukhaari (738) and Muslim (396). An-Nawawi (may Allah have mercy on him) said: The words "Whoever recites the Essence of the Book (i.e., al-Faatihah), that will suffice him, but whoever does more than that, that is better" indicate that it is obligatory to recite al-Faatihah and that the prayer is not valid without it.
Becauseit is only possible to know right from wrong in human after reaching pubescence, Allah Almighty does not call children to account when they are in their childhood. After reaching pubescence asks for the obligations such as fast, prayer etc. So our religious obligations start after reaching pubescence. And it is known that the time (age) of pubescence is not definite.
However if he becomes aware of this before saying the obligatory dhikr, he must slide his forehead onto something on which it is permitted to perform sajdah and then say the obligatory dhikr. If it is not possible for him to slide his forehead, he can say the obligatory dhikr as he is. In both cases, his prayer is valid. Ruling 1075.
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