Prayer is an act of worship that is limited to the way it is prescribed in the religious texts. The Prophet (blessings and peace of Allah be upon him) defined its times, and explained the beginning and end of each time, and how one may catch up with the prayer before its time ends. This hadith highlights one way in which Islamic teachings make it easy to catch up with the time for the prayer, as the Prophet (blessings and peace of Allah be upon him) explained that the one who catches up with one rak‘ah of Fajr prayer before the sun rises – meaning that the worshipper starts to pray before the sun rises and catches up with one rak‘ah of it, then the sun rises – is regarded as having offered the entire prayer on time. Similarly, the one who catches up with one rak‘ah of ‘Asr prayer before the sun sets – meaning that the worshipper starts to pray before the sun sets and completes the other three rak‘ahs as the sun is setting – is regarded as having offered the prayer on time, and he is not to be regarded as having prayed too late. Thus he will attain the virtue and reward of having offered this prayer. What is meant by “rak‘ah” here is one complete rak‘ah, with its ruku‘ (bowing) and sujud (prostration). The prayer may be called ruku‘ (bowing), just as it may also be called sujud (prostration). And it was said that what is meant by “rak‘ah” in the phrase “Whoever catches up with one rak‘ah of Fajr” is bowing in the real sense, not an entire rak‘ah. If catching up with the prayer has to do with the ruling on the prayer, it is the same whether one catches up with a complete rak‘ah or less than that. It is sufficient to catch up with the opening takbir (takbirat al-ihram) [before the time for the prayer ends], because this is the issue of catching up with the prayer (and avoiding falling into sin by missing the prayer), therefore catching up with the rak‘ah is the same as catching up with the takbirat al-ihram. This applies to one who has a legitimate excuse for not having offered the obligatory prayer at the beginning of its time. He may pray at the end of that time, and catch up with the prayer before sunrise and before sunset; otherwise, the best of deeds is offering prayer on time. It was said that what is meant in this hadith is that if a person is among those who are accountable and required to pray, and is able to catch up with as much as one rak‘ah of the prayer before the sun rises, then he is regarded as having caught up with it and fulfilled the obligation of praying Fajr. This applies only to those with legitimate excuses; if a menstruating woman becomes pure (and rushes to do ghusl), or an insane person recovers his sanity, or a Christian becomes Muslim, or a boy reaches puberty, if any of these people catches up with one rak‘ah then he or she has fulfilled the obligation of praying. This hadith indicates that if someone prays one rak‘ah of Fajr, then the sun rises before he completes his prayer, he has caught up with the time of the prayer and his prayer is valid. A similar ruling applies in the case of ‘Asr..