(4) باب فِي وَقْتِ صَلاَةِ الظُّهْرِ
Jabir b. Samurah reported that Bilal used to call for the noon prayer when the sun had declined.
Reference: Sunan Abi Dawud 403
In-book reference: Book 2, Hadith 13
English translation: Book 2, Hadith 403