Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: Whoever catches even one rak'ah of the Asr prayer before sunset, it is as if he has caught the complete Asr prayer, and whoever catches even one rak'ah of the Fajr prayer before sunrise, it is as if he has caught the complete Fajr prayer.