The Book of the Sunnah
0/11.2. Chapter:
The Virtue of 'Umar (ra)
Sunan Ibn Majah
حَدَّثَنَا أَبُو سَلَمَةَ، يَحْيَى بْنُ خَلَفٍ حَدَّثَنَا عَبْدُ الأَعْلَى، عَنْ مُحَمَّدِ بْنِ إِسْحَاقَ، عَنْ مَكْحُولٍ، عَنْ غُضَيْفِ بْنِ الْحَارِثِ، عَنْ أَبِي ذَرٍّ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ " إِنَّ اللَّهَ وَضَعَ الْحَقَّ عَلَى لِسَانِ عُمَرَ يَقُولُ بِهِ " .
It was narrated that Abu Dharr said: "I heard the Messenger of Allah say: 'Allah has placed the truth on the tongue of 'Umar, and he speaks with that (truth).'"
Reference : Sunan Ibn Majah 108In-book reference : Introduction, Hadith 0English translation : Vol. 1, Book 1, Hadith 108