Khaythamah said: By the life of the sun is meant that you may find heat in it.
Hadith Referenceسنن ابي داود / كتاب الصلاة / 406
Hadith Gradingالألبانی:صحيح مقطوع | زبیر علی زئی:إسناده صحيح
Hadith Takhrij« تفرد بہ أبو داود، (تحفة الأشراف:18618) (صحیح) »
Explanation & Benefits
Shaykh Umar Farooq Saeedi
406. Commentary: ➊ This is evidence that the Prophet sallallahu alayhi wa sallam used to perform the Asr prayer at the earliest time, the details of which have already been mentioned: the time for Asr begins when the shadow becomes equal to the length of an object. ➋ The settlements towards the southeast of Madinah were called «عوالي» "the upper area," and the region towards the north was called «سافله» "the lower area."
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 406