FOUR VOLUNTARY UNITS OF PRAYER BEFORE MID-DAY PRAYER H 1136 "The Messenger of Allah, praise and peace be upon him, never omitted to offer four units of prayer before the mid-day prayer." R 1136 Bukhari with a chain up to Lady Ayesha, may Allah be pleased with her, the wife of the Prophet, Mother of Believers who related this.
1114- وعن عائشة رَضِيَ اللهُ عَنها : أنَّ النَّبيَّ صلى الله عليه وآله وسلم كَانَ لا يَدَعُ أرْبَعاً قَبْلَ الظُّهْرِ . رَوَاهُ البُخَارِيُّ .