Sunan Ibn Majah, Volume 3, Book 19, Hadith 2523 (DarusSalam) ⓘ
It was narrated that Abu Dharr said: “I said: 'O Messenger of Allah, which slave is best?' He said: ‘The one who is most precious to his master and most valuable in price.' ”
حَدَّثَنَا أَحْمَدُ بْنُ سِنَانٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، حَدَّثَنَا هِشَامُ بْنُ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ أَبِي مُرَاوِحٍ، عَنْ أَبِي ذَرٍّ، قَالَ قُلْتُ يَا رَسُولَ اللَّهِ أَىُّ الرِّقَابِ أَفْضَلُ قَالَ " أَنْفَسُهَا عِنْدَ أَهْلِهَا وَأَغْلاَهَا ثَمَنًا " .
also referenced under: Hadith 2523 (Reference) & Book 19, Hadith 2619 (In-Book)