Musnad Ahmad 27:561

Yazid narrated to us, Ibn Abi Dhi'b informed us, from Muslim al-Khabbat, from Ibn Umar, who said: "The Messenger of Allah (ﷺ) forbade meeting the riders (to buy their goods before they reach the market), or that a town-dweller sells for a desert-dweller. And let none of you propose to a woman while his brother is proposing, until he marries her or leaves her. And there is no prayer after the Asr (afternoon) prayer until the sun sets, and none after the Subh (morning) prayer until the sun rises or becomes bright."