Hadith 1002

Abu 'Awn said: "I heard Jabir bin Samurah say: 'Umar said to Sa'eed': "The people are complaining about everything about you, even about your prayer." Sa'd said: "I take my time in the first two rak'ahs and I make the other two shorter. I do my best to follow the example of the Messenger of Allah (SAW) in prayer." 'Umar said: 'That is what I thought about you.'"

أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ حَدَّثَنِي أَبُو عَوْنٍ، قَالَ سَمِعْتُ جَابِرَ بْنَ سَمُرَةَ، يَقُولُ قَالَ عُمَرُ لِسَعْدٍ قَدْ شَكَاكَ النَّاسُ فِي كُلِّ شَىْءٍ حَتَّى فِي الصَّلاَةِ ‏.‏ فَقَالَ سَعْدٌ أَتَّئِدُ فِي الأُولَيَيْنِ وَأَحْذِفُ فِي الأُخْرَيَيْنِ وَمَا آلُو مَا اقْتَدَيْتُ بِهِ مِنْ صَلاَةِ رَسُولِ اللَّهِ صلى الله عليه وسلم ‏.‏ قَالَ ذَاكَ الظَّنُّ بِكَ ‏.‏

Reference: 1110070
In-book reference: Book 11, Hadith 1002
Hadith 1002 - The Book of the Commencement of the Prayer - Sunan an-Nasa'i - Sunnah.com