Sayyiduna Abu Basrah al-Ghifari (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) led us in the Asr prayer at a place called al-Mukhammas, and said: "This prayer was presented to those before you, and they neglected it. Whoever guards it will have a double reward. And there is no prayer after it until the shahid rises, and the shahid is the star."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4374