Mishkat al-Masabih
Mishkat al-Masabih 1267
وَعَن خَارِجَة بن حذافة قَالَ: خَرَجَ عَلَيْنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَقَالَ: " إِنَّ اللَّهَ أَمَدَّكُمْ بِصَلَاةٍ هِيَ خَيْرٌ لَكُمْ مِنْ حُمْرِ النِّعَمِ: الْوَتْرُ جَعَلَهُ اللَّهُ لَكُمْ فِيمَا بَيْنَ صَلَاةِ الْعِشَاءِ إِلَى أَنْ يَطْلُعَ الْفَجْرُ ". رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُد
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Kharija ibn Hudhafa said that the Messenger of God came out to them and said: God has granted you an additional prayer that is better for you than prized red camels: the witr prayer. God has appointed it for you between the night prayer and the break of dawn. Al-Tirmidhi and Abu Dawud transmitted it.
Notes and open questions — unreviewed
The Arabic refers literally to red camels, prized possessions in that context.