كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 153
And Abu Musa (RA) narrated regarding the time of 'Asr prayer:
"While the sun is high." [Reported by Muslim in another narration of the former Hadith].
وَمِنْ حَدِيثِ أَبِي مُوسَى: { وَالشَّمْسُ مُرْتَفِعَةٌ } 1‏ .‏
Reference : Bulugh al-Maram 153
In-book reference : Book 2, Hadith 153
English translation : Book 2, Hadith 153
Hadith Text
Reference