Hadith 13073

(حديث مرفوع) حَدَّثَنَا يَزِيدُ ، أَخْبَرَنَا حُمَيْدٌ ، عَنْ أَنَسٍ ، قَالَ : كَانَتْ صَلَاةُ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مُتَقَارِبَةً ، وَأَبُو بَكْرٍ ، حَتَّى كَانَ عُمَرُ فَمَدَّ فِي صَلَاةِ الْغَدَاةِ " .
It is narrated from Hazrat Anas (may Allah be pleased with him) that all the prayers of the Prophet (peace and blessings be upon him) were nearly equal in length, and likewise the prayers of Hazrat Siddiq Akbar (may Allah be pleased with him). However, Hazrat Umar (may Allah be pleased with him) began to lengthen the Fajr prayer.
Hadith Reference مسند احمد / مسند المكثرين من الصحابة / 13073
Hadith Grading حکم دارالسلام: إسناده صحيح، م: 473.