بُلُوغُ الْمَرَامِ
Bulugh al-Maram 212
The Book of Prayer
وَعَنْ أَبِي هُرَيْرَةَ - رضى الله عنه - قَالَ : قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ مَا بَيْنَ اَلْمَشْرِقِ وَالْمَغْرِبِ قِبْلَةٌ } رَوَاهُ اَلتِّرْمِذِيُّ , وَقَوَّاهُ اَلْبُخَارِيُّ . [1]
Narrated Abu Hurairah (RA): Allah's Messenger (ﷺ) said: "The direction between the east and west is Qiblah." [Reported by at-Tirmidhi, and al-Bukhari considered it Qawi (strong)].
Sunnah.com reference: Book 2, Hadith 75