It is narrated from Sayyiduna Abu Basrah al-Ghifari (may Allah be pleased with him) that one day the Messenger of Allah (peace and blessings be upon him) led the Asr prayer at al-Mukhammas, then he turned away and said: "This prayer was presented to those before you, but they were lax about it and abandoned it. So whoever of you prays it will be given double the reward, and there is no prayer after it until the star rises."
Al-Layth said: I also heard this hadith from Khayr bin Nu'aym with this same chain.
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2152