Sufyan bin Wky' bin al-Jrah سفيان بن وكيع بن الجراح · The Book of the Prayer

The Messeenger of Allah said: "Whoever catches one Rak'ah of the Subh before the sun rises, then he has caught it, and whoever catches one Rak'ah of the 'Asr before the sun sets, then he has caught it." (Sahih)Another chain with similar wording.