بُلُوغُ الْمَرَامِ
Bulugh al-Maram 172
The Book of Prayer
وَعَنْ أَبِي مَحْذُورَةَ - رضى الله عنه - أَنَّ اَلنَّبِيَّ - صلى الله عليه وسلم -قَالَ: { أَوَّلُ اَلْوَقْتِ رِضْوَانُ اَللَّهُ, وَأَوْسَطُهُ رَحْمَةُ اَللَّهِ; وَآخِرُهُ عَفْوُ اَللَّهِ } أَخْرَجَهُ اَلدَّارَقُطْنِيُّ بِسَنَدٍ ضَعِيفٍ جِدًّا [1] .
Narrated Abu Mahdhurah (RA): The Prophet (ﷺ) said: "The earliest time of prayer is what pleases Allah, the midtime is for the mercy of Allah and the latest time is what Allah pardons." [Reported by ad-Daraqutni with a very weak Sanad (chain)].
Sunnah.com reference: Book 2, Hadith 25