Musannaf Ibn Abi Shayba 3:3913

Waki’ narrated to us, he said: Al-Awza’i narrated to us, from Yahya ibn Abi Kathir, from Abu Qilabah, from Abu al-Muhajir, from Buraydah al-Aslami, who said: We were with him on a military expedition, and he said: I heard the Prophet, may Allah bless him and grant him peace, saying: "Hasten with the prayer on a cloudy day, for whoever misses the Asr prayer, his deeds are rendered void."